Isolating workspaces doesn't work

I have the setting "Isolate workspaces" turned on in the taskbar settings. But even so, starting an application will take me to another workspace where the instance already exists. I want to create a new instance in a new workspace.

Using Zorin 16 Core
I've tried terminal command of gsettings that used dash to dock extension but response was that it doesn't exist. Most of the posts imply that it is installed by default.
Did I break something over here ? I don't use separate workspaces often and I think (not sure) that isolating workspace option did work previously

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