How do I save a certain workspace as the default workspace (not default upon opening blender) I want to save the default compositing workspace a certain way so that when I open the compositor, it's the setup I like. I've figured out how to save the interface for opening blender however, I'm wondering: how do I save the default interface to only that interface (basically the compositor won't be the default opening blender scene)
Any changes you make to any of the workspaces can be saved as part of your Startup File.
Here's my Compositing screen, I also enabled the denoising data passes so I could denoise renders by default.

Just open a new file, make any changes, and go to this menu.  Whatever workspace you're currently in will be the one Blender opens to.