so I'm working on a little bathroom scene and wanted to make a clay render. I started looking for the material override which I kinda knew where it was and on the way I switched my render engine accidently to workbench instead of cycles. Switched to cycles all my seetings on the render tab are missing except color management and free style. Hows that? I restarted blender multiple times and tried some other stuff but nothing changed a thing, and I'd rather avoid a new installation
This typically happens, when you check ✓ Filter Add-ons in the Tool tab.
Filter Addons allows disabling certain addons under certain workspaces. Since Cycles is integrated into Blender through an addon that means it gets disabled as well.
Otherwise check to see if the addon is globally enabled in Preferences > Addons.
Try a new file, then in the file open dialog you will see a gear icon in the upper right. Click it, then untick "Load UI". See if that brings things back for you. You could also try restarting your computer. Otherwise, you may have a corrupt .blend file? In that case, you might be able to File>Append your assets from the old file into a new one.