How can the Web-admin settings be saved permanently?

My YunoHost server

Hardware: Old computer at home
YunoHost version: 4.2.6.1
I have access to my server : Through SSH | through the webadmin
Are you in a special context or did you perform some particular tweaking on your YunoHost instance ? : no

Description of my issue

The YunoHost Web-admin settings are not saved permanently. For example I set it like this:

But after closing the webadmin these settings are lost. The next time I open the webadmin the default settings are used again.

Questions:

  • Where are these settings saved?
  • How can these settings be saved permanently?