Part of macOS
com.apple.appkit.xpc.openAndSavePanelServiceOpen and Save windows
○ Leave it
Shows the Open and Save windows for apps.
What it is
Draws the file windows apps use to open and save documents.
If you stop it
Any Open or Save window closes. Leave it.
The verdict
○ Leave it. Part of macOS, or something that starts again by itself. You never need to close these.
In Activity Monitor
com.apple.appkit.xpc.openAndSavePanelService
From Procession’s guide, in the words the app shows.