To get Details everywhere by default, follow this guide:
Then, to make Opus automatically to Thumbnails mode in folders with images (etc.):
- Turn on Preferences / Folders / Folder Behaviour / Enable Folder Content Type detection for... for the folder type(s) you want.
- Go to Preferences / Folders / Folder Formats and turn on and edit the Content Type Formats you're interested in, to make them change to thumbnails mode or whatever you want to happen.
- See Content Types in the manual for more detail about them.