libgtk-2_0-0 from home:MaxxedSUSE:15.6 project
Select Your Operating System
Add repository and install manually
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:MaxxedSUSE:15.6/15.6/home:MaxxedSUSE:15.6.repo zypper refresh zypper install libgtk-2_0-0