Upon launching doom-emacs, it displays
What does the options
It toggle  as default, how could I toggle 1
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Those are your open workspaces. Workspace #1 is named "main". Workspace #2 is named "#1" (new workspaces are named in this format:
#N). Workspace #2 is active (hence it's highlighting).
You can switch to workspaces 1 via SPCTAB1 or meta1 or (for non-evil users) C-cw1.
You can get this display by pressing SPCTABTAB (or C-cwd for non-evil users), both are bound to
This functionality is provided by the
:ui workspaces module, which is configured to auto-display your workspaces (like you see) whenever a new workspace is created (one is created every time you open a new frame so you have a fresh workspace per frame).
Here are some other things you can do with workspaces:
Hope that helps!