When you click Polygon button Property Manager should open for a option. It does not open in my 2019 SWX but it is okay with 2018 and 2020 which I have.
1. Only polygon tool?
2. What happens if you click the tab for the PMP?
I mean when you click Polygon button PM should be open spontaneously in my case it is not. I have to click the PM tab to open it, that mean it is not default. Before it was not the case. Only Polygon button has this issue. Other buttons are okay.
Since it's only the polygon tool, and it still works when you click the PM tab, it seems unlikely that it's an option you've inadvertently toggled. The only suggestion I have is corrupt install. I'm running 2019 sp5 and mine shows automatically.
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