How to fix greyed out collections and their visibility after opening an old Blender file in 2.8

25games writes:

Blender 2.8 was published lately while our game production on Kordex. I modeled already a pretty huge part of the cave level in Blender 2.79 and need to continue with Blender 2.8 now. But I hit at this problem and want to share my solution with you!

Those greyed out collections annoyed me a lot because I was not able to enable the visibility at first. Hope I can help you with this information!
Cheers!

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