Escape key should close the ‘Search in all files’ tab (
Shift+Cmd+F). Here is the similar suggestion about tag search.
Esc key closes ‘Search/(Replace) in files’ panes, so I think it is a good idea to add the same functionality to ‘Search in all files’ as well.
Came here to say the same thing. If Cmd+Shift+F activates a mode, Escape should deactivate that mode.