Hi @Bastian_Mei
I’m crossposting a reply from this other thread because it may apply to you too.
Across the bike industry - right pedals are normal-threaded, and left pedals are reverse-threaded. Each pedal should be clearly marked Right and Left.
The crankarms will follow suit, and will have an arrow showing the direction to tighten each pedal in the correct direction.
Please verify that this is the case on the Ride frame you received. As always, if something is amiss, please contact Zwift Support for assistance.