Is there a way to change how help page is displayed in management client in a way that help page occupy whole area as highlighted in blue on attached photo?Or is it possible to change icon on help page that is basically topTreeNode icon but stretched?

MIP
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You can’t change left margin and upper margin but you can change right and bottom one when you select a textbox and set its Dock property as “Fill” in your HelpPage, that is HelpPage class (class HelpPage : ItemNodeUserControl).

Regarding the icon, that is fixed one so you can’t change it.