No permissions on game start in Fortnite creative mode?

I have a very annoying problem with the creative mode in Fortnite. I did an editing parkour and wanted to use it. For this you have to start the "game" in creative mode, so that everything is reset to the beginning when you are done with the Parkour. Only the problem is that when I set everything as it should and then press Start game, I do not even have permissions to walls, stairs, etc. To edit. Can someone help me with the same problem and solve it?

I would be very happy about helpful answers!

That you can change in settings that can edit everything

If I do that, it still will not work. Then I can only edit the things in the build after the game start.

i have the same problem.