Trouble changing the name of the homefolder

Hi,

I want to change the home folder to just my first name. Since I do a lot of screen sharing and remote work I don't think it is necessary that people see my last name and it saves typing. However, when I tried this via Settings - Users and Groups - right-click my name - Advanced Options - Home folder - either changing the name or choosing an existing folder on the /Users the whole settings just get stuck.

Sometimes I get a prompt with 'for this, you need to restart your computer' and when I hit 'okay' it doesn't restart. If I want to restart manually, system settings prevent this. The only option is to forcefully shut down system settings.

Can someone help? What should I do? See here when I press okay (it's Dutch, my native language): https://imgur.com/a/lQRtwm2