If you look in the available screensavers, you'll find entries for "Pictures Folder", "WebCollage", and "MyCollage". Each entry corresponds to a .desktop configuration file in /usr/share/applications/screensavers
- personal-slideshow.desktop configures the "Pictures Folder" screensaver
- webcollage.desktop configures the "Web Collage" screensaver
- mycollage.desktop configures the "My Collage" screensaver
It is the last configuration file which you should edit for the directory in which the photos you want displayed are located. It could be /home/<user>/Pictures, or anywhere else on your computer.
Hope this helps!
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