Hello,
We found that issue is caused by Yoast SEO plugin that generates errors in the console https://prnt.sc/1nc73e2 and 500 error once you try to save changes https://prnt.sc/1nb2yvp
So, check the server error logs and contact plugin author to fix the issue because it appears not just with our theme but with the default Storefront theme too https://prnt.sc/1ncaujc
Regards
