"Routing - both Coppersides" gray and not selectable

Hello!
I’m trying to create my first PCB and needs to use both copper sides. in the Inspector the PCB1 is set to “two layers”, but I can not select both coppersides at the routing menu.
This problem does not exist with a new project, but i have invested a lot of time in my first layout … Is there a hint ?
thanks a lot
Kris

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Found a solution … (really simple!)
delete the PCB1, insert a new one with both layers
so simple …
kris

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