I don't know what I did, TextMate 2 expanded the entire files of my project in the sidebar. Now the performance drastically went down. I can't able to figure out how to collapse it.
Macos – Expand/Collapse project drawer folders in TextMate 2
macostextmate-2
Best Answer
You can hold option while clicking the 'Disclosure Arrow' (the little arrow next to the directory name) to recursively collapse all subfolders.
To collapse all the directories without performing the action for every folder, do this:
control+tab
to move the focus to the file drawer.command+up arrow
to 'go up a level'.option
and click the arrow next to your desired folder.Reference: http://wiki.macromates.com/FAQ/TextMate2