Presets verdunkeln das Vorschaufenster im Entwicklungsmodus

Google translation: " I'm using Adobe Lightroom 11.4.1 on Windows 10 and since this version, when I apply a preset to an image, it turns black or partially black or even blue in the display (screenshot attached). I can do that in the library module View the image normally and the preset is also applied during export. However, it is not possible to edit the image properly. What can I do?"

That kind of garbled display usually indicates either a corrupted file or a problem with the graphics processor. Since you can export the photo with the preset applied, that likely rules out a corrupted file.

So try setting Preferences > Performance > Use Graphics Processor Off.  And then update your graphics driver by going directly to the manufacturer's web site, as described here:

https://helpx.adobe.com/lightroom-classic/kb/troubleshoot-gpu.html#solution-4 

If that doesn't help, please do the menu command Help > System Info and copy/paste the output here.