Nach dem Wechsel der Grafikkarte wird die GPU nicht erkannt (AMD Radeon RX 9070). Es sind die neuesten Treiber installiert. WIN 11 Update ebenfalls ausgeführt .

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1. Try deleting the file "Camera Raw GPU Config.txt" as detailed here:
https://helpx.adobe.com/lightroom-classic/kb/troubleshoot-gpu.html#solution-3
 
That will cause LR to reevaluate the capabilities of your GPU. 
 
2. Then delete any TempDisableGPU2 and TempDisableGPU3 files:
https://helpx.adobe.com/camera-raw/kb/acr-gpu-faq.html#6CheckanddeletetheTempDisableGPU3orTempDisableGPU2files
 
3. After doing that, restart LR. Then go to Preferences > Performance to verify that Use Graphics Processor is set to Auto. If you see any kind of "unsupported" message, please post a full-resolution screenshot (not a phone pic) of the Preferences window.

4. If that doesn’t help, then please do the LR menu command Help > System Info, click the Copy button in the upper right corner, and paste into your reply here, so we can see exactly which versions of hardware and software LR thinks you're running and important LR options that are set.