Some windows in panels remain a percentage width of the parent panel that they're in, rather than being able to drag borders to suit user preferences and editing requirements.
It would be great to see an overhaul of the GUI panels/windows for convenience and workflow.
Other suggestions...
Custom-colouring of macro icons in the project explorer window, so that you can quickly identify macros needing attention or under development (etc..etc).
'Relevance' option text that can be attached to custom icon colours, allowing users to search for "Debug", "Needs Testing", etc., complimenting the 'Where Used' feature. I'd also like to see the 'no gradient' option persistent unless changed

A simple editable unlimited text page icon at the top of the explorer window, allowing users to quickly add/review their own project notes/reminders/comments/source links/etc.
A 'constant' that provides the current project filename, for use in the program flow - such as to dynamically report source file version info to the connected host/screen/etc., optionally in conjunction with the timestamp Auto Version Identifier component.
Many thanks,
Brendan