Photo as screensavers in Monterey?

Right now you can't. There's a but with the latest release of Monterey that affects all screensaver themes that use image files, whether in a Photos library or in a folder on the hard drive.

Until Apple releases a fix in a system update we'll have to use a screensaver that does not use image files. I use a 3rd party screen saver called Brooklyn.

Hey INTVG,

Thank you for using Apple Support Communities!

We see from your post that you're having trouble setting your screen saver on your Mac using Monterey. We can help!

Here's how:

Use a screen saver on your Mac - Apple Support

Cheers!

To avoid the bug, try to export a few favourite photos to a folder in your pictures folder and use this folder as the source of the screensaver. I am using the third-party screensaver Art Saver with a local folder of pictures. That is fortunately still working and has the added bonus to allow to show the filename and other metadata with the photos.