Still not showing the option to select the sub-projects. The error message is still there as shown at the top of this preferences menu.

Maybe this will help: https://github.com/BOINC/boinc/wiki/ProjectSpecificPrefs
https://github.com/BOINC/boinc/wiki/AppFiltering

Not sure if you need to restart the server or re-read the updated file(s). P.S. I've no experience is setting up boinc server project. Best to ask the expert in the boinc discord.

fixed

fixed

Awesome! I can now see the sub-project selections.

Thank you zupa

Conan

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EDIT.... NOW IT'S WORKING AND SAVING CHANGES.
Something is still not working correctly.

I can't change/add any other venues such as Home, Work, School I go to edit them, make changes, save but nothing updates/saves.

Same thing for Default venue, check the box for "If no work for selected applications is available, accept work from other applications?" Click save but nothing updates/saves there either.