To edit portal themes using the UI Theme Designer, you must first activate it from SAP NetWeaver Administrator.
You have the relevant permissions to view and edit themes.
Before activating the UI Theme Designer, export themes created with the Theme Editor that you would like to continue to use with the UI Theme Designer.
You can use the Theme Editor or the UI Theme Designer to develop one or more themes for your portal users. To edit portal themes using the UI Theme Designer, you must first activate it from SAP NetWeaver Administrator.
You can now customize themes using UI Theme Designer. The Theme Editor is disabled.
To switch back to using the Theme Editor, delete the Less value from the Determine what will be the theme runtime provider property and restart the portal service.