For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:wolfi323:branches:KDE:Frameworks5/openSUSE_Tumbleweed/home:wolfi323:branches:KDE:Frameworks5.repo
zypper refresh
zypper install elektra-qt-gui
For openSUSE Factory run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:wolfi323:branches:KDE:Frameworks5/openSUSE_Factory/home:wolfi323:branches:KDE:Frameworks5.repo
zypper refresh
zypper install elektra-qt-gui