I Highly recommand to DON'T do this because, even if items are invisible, they are still selectable and editable with mouse drag so you can completly mess up your session
see ->
https://drive.google.com/open?id=1Xc...9x33cVwTxtTGYI
But, if you really want this behavior here's the procedure
- Options -> show resource path in explorer
- in the color themes folder, unzip your theme file
- open theme folder and search for a txt file called "rtconfig and open it with any txt editor
- search for this line -> tcp_heights 4 24 35 58 ; supercollapsed, collapsed, small(norecarm), recarm size
the number represent the tcp heigt for each folder state
4 superllapsed
24 collapsed
35 small
58 non folder
the number can be different according to your theme
just change the value of supercollapsed to 0 and save the rtconfig file
- Select theme folder and reapertheme file and zip to an new file and change extension to .ReaperThemeZip
In REAPER, load your brand new theme
voilà