[Feature Request] Hiding Menu Bar, Customizable Toolbar, Show used/free space for drives

[ingostrohmeier]

Here are a few suggestions for improvements I'd love to see in Cosmic Files.

1. Option to completely hide the menu bar (not hiding title bar). Right click or Hotkey to show. This would als be cool for terminal.
2. Option to add customizable toolbar for frequently used actions like New Folder, Open in Terminal,... (see attached screenshot)
3. Display free/used disk space in side panel (see attached screenshot)