For openSUSE Leap 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:mlin7442:rebuild_fails_155:mate/openSUSE_Leap_15.5/home:mlin7442:rebuild_fails_155:mate.repo
zypper refresh
zypper install mate-tweak
For openSUSE Backports SLE-15-SP5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:mlin7442:rebuild_fails_155:mate/openSUSE_Backports_SLE-15-SP5/home:mlin7442:rebuild_fails_155:mate.repo
zypper refresh
zypper install mate-tweak