Thanks for posting in Q&A platform.
Based on provided information, my understanding is that if you want to enable Turn on network discovery and Turn on automatic setup of network connected devices, the changes cannot be saved. May I know if there is any error message occurred when saved these changes?
Did you have any third party software installed? Please check the installed third party software or do a clean boot and then see if you can save the configuration.
Or I would suggest you could disable Windows firewall temporally to see if the issue still existed.
I also found some articles regarding of network computers are not showing up, please try methods in these articles to see if the issue can be resolved.
Network Computers are not Showing Up in Windows 10
Can’t See Other Computers on a Network? Fixes For Windows, Mac, and Linux
Please Note: Since the websites are not hosted by Microsoft, the links may change without notice. Microsoft does not guarantee the accuracy of this information.
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