libxfce4panel-2_0-4 from home:mantarimay:xfce project
Select Your Operating System
Add repository and install manually
For rat run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:mantarimay:xfce/rat/home:mantarimay:xfce.repo zypper refresh zypper install libxfce4panel-2_0-4