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This tip is gold. I had no idea Edge had this feature on Mac. I have used a variety of other tools in the past to create website "apps". Thanks!

Also possible with Chrome.

How?

Hot dog menu -> More tools -> Create Shortcut -> check the "Open as Window" checkbox

For PWAs (web apps that do additional things to make them work more like apps) there may also be a simpler install button in the url bar itself

Just check out the little button in the address bar on the right.