HOW TO Clear screenshots out of your library
1 Find screen grabs
If you take screenshots on iOS, they’ll end up in iCloud Photo Library and on all connected devices. You can view them in the Screenshots album in Photos. Sadly, there’s no way to stop any you keep from showing up elsewhere in your library.
2 Select and delete
Hold ç and click screenshots you no longer want to build a selection, then ≈- click one, choose Delete and click the Delete button on the confirmation dialog. Made a mistake or changed your mind? They can be recovered within 40 days.
3 Save keepers
Go to the Recently Deleted album and select those images you want back, then click Recover. Or, hold å and drag them to Finder to save them outside of Photos; this copies them as PNG files, rather than compressed JPEGs.