If a picture is useful in an album but clutters the main Photos view, you can archive it. On a computer, select the picture in Google Photos and choose More → Archive. Google says archived photos remain in their albums and search results. They still count toward the account’s storage quota.
Check two views of the same picture
For example, keep a picture of a workshop sign in the “Workshop” album and archive it from the main view. Open the main grid and then the album. The picture should be absent from the grid and still present in the album. People who already have access to a shared album may still see it there.
Bring it back if needed
Open Archive, select the picture and choose Unarchive from the menu. Reopen the main Photos view and check that it is back. Use Archive for organising the grid. Review album sharing separately if you need to change who can see a picture.