For Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:hsk17:branches:X11:Utilities/Tumbleweed/home:hsk17:branches:X11:Utilities.repo
zypper refresh
zypper install xview
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:hsk17:branches:X11:Utilities/15.6/home:hsk17:branches:X11:Utilities.repo
zypper refresh
zypper install xview
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:hsk17:branches:X11:Utilities/15.5/home:hsk17:branches:X11:Utilities.repo
zypper refresh
zypper install xview