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No errors in the console and this happened also in new empty projects.
BTW I installed a fresh copy of Unity 2019.2.0b4 and this...
Yes, sure. I installed it by Unity Hub
Also tried 2018.3.9f1 with same issue
Sorry! I edited the post.
When trying to do that, nothing happened (none of the Preferences or Package Manager window appeared).
My unity version is 2019.1.1f1
I tried many ways with no success. Your support is appreciated..