Hello PerserPolis-1732,
Thank you for posting in Q&A forum.
Not sure how did you deleted the GPO. You can try the methods below and check if it helps.
1.You can try to restart the machine and check if the screen saver GPO disappears.
2.You can try to undo the GPO setting instead of deleted the GPO and check if it helps (for example, you can change the setting to disabled or undefined).
3.You can unlink the GPO and check if it helps.
4.You can disable the GPO and check if it helps.
I hope the information above is helpful.
If you have any questions or concerns, please feel free to let us know.
Best Regards,
Daisy Zhou
============================================
If the Answer is helpful, please click "Accept Answer" and upvote it.