Anyone coming from Zorin OS 16 (don't know if 15.3 is the same): The option is called "Isolate Workspaces" and is found in the Taskbar Settings (Right click on Taskbar, choose "Taskbar settings", then in the "Behaviour" Tab check "Isolate Workspaces")
Hi and welcome to the forum
Rather than necromancing the thread from last year, I created a new thread for you.
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