diff --git a/templates/SilverStripe/SiteConfig/Includes/SiteConfigLeftAndMain_EditForm.ss b/templates/SilverStripe/SiteConfig/Includes/SiteConfigLeftAndMain_EditForm.ss
index c8165b671..c1b22f36c 100644
--- a/templates/SilverStripe/SiteConfig/Includes/SiteConfigLeftAndMain_EditForm.ss
+++ b/templates/SilverStripe/SiteConfig/Includes/SiteConfigLeftAndMain_EditForm.ss
@@ -30,9 +30,9 @@
 
 			<% if $hasExtraClass('cms-previewable') %>
 				<% if $Actions.last.id == 'Form_ItemEditForm_RightGroup' %>
-					<% include SilverStripe\\Admin\\LeftAndMain_ViewModeSelector SelectID="preview-mode-dropdown-in-content", ExtraClass="ml-0" %>
+					<% include SilverStripe\\Admin\\LeftAndMain_ViewModeSelector SelectID="preview-mode-dropdown-in-content", ExtraClass="ms-0" %>
 				<% else %>
-					<% include SilverStripe\\Admin\\LeftAndMain_ViewModeSelector SelectID="preview-mode-dropdown-in-content", ExtraClass="ml-auto" %>
+					<% include SilverStripe\\Admin\\LeftAndMain_ViewModeSelector SelectID="preview-mode-dropdown-in-content", ExtraClass="ms-auto" %>
 				<% end_if %>
 			<% end_if %>
 		</div>