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UE5 EA - Material Parameter Collection Not Working, opens up a Nothing-Window

UE5 EA - Material Parameter Collection:
When you create a Material Parameter Collection, you can’t do anything.
It has nothing to select, edit, adjust, or add. It is just a blank window that does nothing.
Right Clicking on mouse does nothing.
It is Functionless:

Okay wait…you have to manually go up to Window and click on Details…!
I would suggest making this active at default open, otherwise users will be confused, as I was.
Like, why add the extra step- to make it slower? No, make it FASTER!

not sure why its heppening for you, but in my projects they always open with details open, however, if you close it and then close the MPC window, it remembers the setting and will open without it.