Where to configure the default user group for file/directory creation? I would like to configure the default group for any file or directory which is created by my user. I am not sure where to start. Could somebody point me the right direction? My user lives in Active Directory and by default I get the default AD group. I am wondering if I could override this behavior on my computer.

[myuser::~]touch test_file

[myuser::~]ls -alrth test_file

-rw-r--r--  1 myuser  AD\Domain Users     0B Mar 19 10:40 test_file
I don't see a way to do this. Since network accounts have their groups managed by the network account server, it doesn't look like this can be overridden locally. And since the user is part of the network account server they are technically not part of a local user group.

As a test, I used Advanced Options to modify my network user to group 80 (local admins group). Upon reboot my user belonged to the AD group again.

If you want to change group ownership, you will probably need to use the chown user:group functionality in the Terminal on each file or folder you want to modify ownership permissions over.

Another option, of course, is to work off of a local user account and use your network credentials when accessing network resources. You will lose awesome things like single-sign-on though.