diff --git a/packages/pluggableWidgets/custom-chart-web/src/hooks/useCustomChart.ts b/packages/pluggableWidgets/custom-chart-web/src/hooks/useCustomChart.ts
index ef1965be27..3f130163b6 100644
--- a/packages/pluggableWidgets/custom-chart-web/src/hooks/useCustomChart.ts
+++ b/packages/pluggableWidgets/custom-chart-web/src/hooks/useCustomChart.ts
@@ -1,22 +1,18 @@
 import { debounce } from "@mendix/widget-plugin-platform/utils/debounce";
-import { useEffect, useMemo, useRef, useState, type RefObject } from "react";
+import { useEffect, useMemo, useRef, useState, type RefObject, CSSProperties } from "react";
 import { CustomChartContainerProps } from "../../typings/CustomChartProps";
 import { PlotlyChart, ChartProps } from "../components/PlotlyChart";
-import { ChartDataProcessor } from "../utils/ChartDataProcessor";
+import { parseData, parseLayout, parseConfig } from "../utils/utils";
 
 interface UseCustomChartReturn {
     chartRef: RefObject<HTMLDivElement>;
-    containerStyle: {
-        width?: string;
-        height?: string;
-    };
+    containerStyle: CSSProperties;
 }
 
 export function useCustomChart(props: CustomChartContainerProps): UseCustomChartReturn {
     const chartRef = useRef<HTMLDivElement>(null);
     const [chart, setChart] = useState<PlotlyChart | null>(null);
     const [containerDimensions, setContainerDimensions] = useState<{ width?: number; height?: number }>({});
-    const dataProcessor = useRef(new ChartDataProcessor());
 
     const [setContainerDimensionsDebounced, abortDimensionsDebounce] = useMemo(
         () =>
@@ -63,74 +59,65 @@ export function useCustomChart(props: CustomChartContainerProps): UseCustomChart
             return;
         }
 
-        const data = dataProcessor.current.parseData(props.dataStatic, props.dataAttribute?.value, props.sampleData);
-
-        const layout = dataProcessor.current.parseLayout(
-            props.layoutStatic,
-            props.layoutAttribute?.value,
-            props.sampleLayout
-        );
+        const data = parseData(props.dataStatic, props.dataAttribute?.value, props.sampleData);
 
-        const dimensions = dataProcessor.current.calculateDimensions(
-            props.widthUnit,
-            props.width,
-            props.heightUnit,
-            props.height,
-            containerDimensions.width,
-            containerDimensions.height
-        );
+        const layout = parseLayout(props.layoutStatic, props.layoutAttribute?.value, props.sampleLayout);
 
-        const { width, height } = dimensions;
+        const dimensions = {
+            width: containerDimensions.width ?? 0,
+            height: containerDimensions.height ?? 0
+        };
 
         const updateData: ChartProps = {
             data,
             layout: {
                 ...layout,
-                width,
-                height,
+                width: dimensions.width,
+                height: dimensions.height,
                 autosize: true,
                 font: {
                     family: "Open Sans, sans-serif",
-                    size: Math.max(12 * (width / 1000), 8)
+                    size: Math.max(12 * (dimensions.width / 1000), 8)
                 },
                 legend: {
                     ...layout.legend,
                     font: {
                         ...layout.legend?.font,
-                        size: Math.max(10 * (width / 1000), 7)
+                        size: Math.max(10 * (dimensions.width / 1000), 7)
                     },
-                    itemwidth: Math.max(10 * (width / 1000), 3)
+                    itemwidth: Math.max(10 * (dimensions.width / 1000), 3),
+                    itemsizing: "constant"
                 },
                 xaxis: {
                     ...layout.xaxis,
                     tickfont: {
                         ...layout.xaxis?.tickfont,
-                        size: Math.max(10 * (width / 1000), 7)
+                        size: Math.max(10 * (dimensions.width / 1000), 7)
                     }
                 },
                 yaxis: {
                     ...layout.yaxis,
                     tickfont: {
                         ...layout.yaxis?.tickfont,
-                        size: Math.max(10 * (width / 1000), 7)
+                        size: Math.max(10 * (dimensions.width / 1000), 7)
                     }
                 },
                 margin: {
                     ...layout.margin,
-                    l: Math.max(50 * (width / 1000), 30),
-                    r: Math.max(50 * (width / 1000), 30),
-                    t: Math.max(50 * (width / 1000), 30),
-                    b: Math.max(50 * (width / 1000), 30),
-                    pad: Math.max(4 * (width / 1000), 2)
+                    l: Math.max(50 * (dimensions.width / 1000), 30),
+                    r: Math.max(50 * (dimensions.width / 1000), 30),
+                    t: Math.max(50 * (dimensions.width / 1000), 30),
+                    b: Math.max(50 * (dimensions.width / 1000), 30),
+                    pad: Math.max(4 * (dimensions.width / 1000), 2)
                 }
             },
             config: {
-                ...dataProcessor.current.parseConfig(props.configurationOptions),
+                ...parseConfig(props.configurationOptions),
                 displayModeBar: props.devMode === "developer",
                 responsive: true
             },
-            width,
-            height
+            width: dimensions.width,
+            height: dimensions.height
         };
 
         updateChartDebounced(chart, updateData);
diff --git a/packages/pluggableWidgets/custom-chart-web/src/utils/ChartDataProcessor.ts b/packages/pluggableWidgets/custom-chart-web/src/utils/ChartDataProcessor.ts
deleted file mode 100644
index 3f5e8144b5..0000000000
--- a/packages/pluggableWidgets/custom-chart-web/src/utils/ChartDataProcessor.ts
+++ /dev/null
@@ -1,79 +0,0 @@
-import { Config, Data, Layout } from "plotly.js-dist-min";
-
-export class ChartDataProcessor {
-    parseData(staticData?: string, attributeData?: string, sampleData?: string): Data[] {
-        let finalData: Data[] = [];
-
-        try {
-            if (staticData) {
-                finalData = [...finalData, ...JSON.parse(staticData)];
-            }
-            if (attributeData) {
-                finalData = [...finalData, ...JSON.parse(attributeData)];
-            }
-            if (!finalData.length && sampleData) {
-                finalData = [...finalData, ...JSON.parse(sampleData)];
-            }
-        } catch (error) {
-            console.error("Error parsing chart data:", error);
-        }
-
-        return finalData;
-    }
-
-    parseLayout(staticLayout?: string, attributeLayout?: string, sampleLayout?: string): Partial<Layout> {
-        let finalLayout: Partial<Layout> = {};
-
-        try {
-            if (staticLayout) {
-                finalLayout = { ...finalLayout, ...JSON.parse(staticLayout) };
-            }
-            if (attributeLayout) {
-                finalLayout = { ...finalLayout, ...JSON.parse(attributeLayout) };
-            }
-            if (Object.keys(finalLayout).length === 0 && sampleLayout) {
-                finalLayout = { ...finalLayout, ...JSON.parse(sampleLayout) };
-            }
-        } catch (error) {
-            console.error("Error parsing chart layout:", error);
-        }
-        return finalLayout;
-    }
-
-    parseConfig(configOptions?: string): Partial<Config> {
-        if (!configOptions) {
-            return {};
-        }
-
-        try {
-            return JSON.parse(configOptions);
-        } catch (error) {
-            console.error("Error parsing chart config:", error);
-            return {};
-        }
-    }
-
-    calculateDimensions(
-        widthUnit: "percentage" | "pixels",
-        width: number,
-        heightUnit: "percentageOfWidth" | "pixels" | "percentageOfParent",
-        height: number,
-        containerWidth?: number,
-        containerHeight?: number
-    ): { width: number; height: number } {
-        let finalWidth = width;
-        let finalHeight = height;
-
-        if (widthUnit === "percentage" && containerWidth) {
-            finalWidth = (containerWidth * width) / 100;
-        }
-
-        if (heightUnit === "percentageOfWidth") {
-            finalHeight = (finalWidth * height) / 100;
-        } else if (heightUnit === "percentageOfParent" && containerHeight) {
-            finalHeight = (containerHeight * height) / 100;
-        }
-
-        return { width: finalWidth, height: finalHeight };
-    }
-}
diff --git a/packages/pluggableWidgets/custom-chart-web/src/utils/utils.ts b/packages/pluggableWidgets/custom-chart-web/src/utils/utils.ts
new file mode 100644
index 0000000000..f4b9d44046
--- /dev/null
+++ b/packages/pluggableWidgets/custom-chart-web/src/utils/utils.ts
@@ -0,0 +1,53 @@
+import { Config, Data, Layout } from "plotly.js-dist-min";
+
+export function parseData(staticData?: string, attributeData?: string, sampleData?: string): Data[] {
+    let finalData: Data[] = [];
+
+    try {
+        if (staticData) {
+            finalData = [...finalData, ...JSON.parse(staticData)];
+        }
+        if (attributeData) {
+            finalData = [...finalData, ...JSON.parse(attributeData)];
+        }
+        if (!finalData.length && sampleData) {
+            finalData = [...finalData, ...JSON.parse(sampleData)];
+        }
+    } catch (error) {
+        console.error("Error parsing chart data:", error);
+    }
+
+    return finalData;
+}
+
+export function parseLayout(staticLayout?: string, attributeLayout?: string, sampleLayout?: string): Partial<Layout> {
+    let finalLayout: Partial<Layout> = {};
+
+    try {
+        if (staticLayout) {
+            finalLayout = { ...finalLayout, ...JSON.parse(staticLayout) };
+        }
+        if (attributeLayout) {
+            finalLayout = { ...finalLayout, ...JSON.parse(attributeLayout) };
+        }
+        if (Object.keys(finalLayout).length === 0 && sampleLayout) {
+            finalLayout = { ...finalLayout, ...JSON.parse(sampleLayout) };
+        }
+    } catch (error) {
+        console.error("Error parsing chart layout:", error);
+    }
+    return finalLayout;
+}
+
+export function parseConfig(configOptions?: string): Partial<Config> {
+    if (!configOptions) {
+        return {};
+    }
+
+    try {
+        return JSON.parse(configOptions);
+    } catch (error) {
+        console.error("Error parsing chart config:", error);
+        return {};
+    }
+}