If you did not migrate your account yet, visit https://idp-portal-info.suse.com/
OpenSUSE comes with a simple script and a YaST interface to disable PulseAudio for some applications in the system. To run it, open a terminal and do
sudo setup-pulseaudio --disable
The current status can be checked with
GNOME specific instructions
Refer to this wiki page for further information on disabling pulseaudio in a Gnome desktop environment.