Linux changing sudo/admin status requires restart?

Distribution: Fedora Linux 44 (Workstation Edition)

I created a new Linux user and gave it admin with the gui interface, I then switched to it, but could not run sudo commands.

So I entered sudo usermod -a -G wheel [USER] to grant sudo rights through the cli, but still, the new user could not use sudo.

I logged in and out multiple times, but it did not help.

Then I restarted Linux and suddenly the new user could use sudo.

To test if it was now working, I striped sudo rights from the new user. But then I realized that the new user could still use sudo.

So it seems that sudo privileges only update on operating system restart? Is this correct, or is something wrong with my system?

Sorry if this is a stupid post