For openSUSE Leap 15.7 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:digitaltomm/openSUSE_Leap_15.7/home:digitaltomm.repo
zypper refresh
zypper install arandr
For openSUSE Leap 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:digitaltomm/openSUSE_Leap_15.6/home:digitaltomm.repo
zypper refresh
zypper install arandr
For openSUSE Leap 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:digitaltomm/openSUSE_Leap_15.5/home:digitaltomm.repo
zypper refresh
zypper install arandr