somehow all of my photos got pinned to my startup window. how can i remove

Hello Wickedoneinmn,

Thanks for visiting Apple Support Communities. We understand that you accidentally moved your pictures to your Desktop on your Mac. Were you exporting your pictures from the Photos app, or importing them from an iOS device:

Export photos, videos, and slideshows from Photos on Mac

Import photos from a camera or phone using Photos on Mac

If these are just copies, it should be safe to delete them. If they're not copies, you'll want to move them back to their correct location: Drag and drop items on Mac

Before making any changes, we recommend backing up your Mac to ensure all your data and pictures stay safe and sound: How to back up your Mac

We hope this helps.

Take care.