I’m on MS Store and don’t know anything about Steam.
But, FS2020 will tell you where your “Installed Packages”,
including the Community Folder, are.
That is in the last line of your UserCfg.opt file.
Use File Explorer.
Access it with Notepad.
This is where FS2020 reads and stores its files.
Delete all others if you want to reclaim that disk space.