xfce4-panel-plugin-notes from openSUSE:Backports:SLE-15 project
Selecionar o Seu Sistema Operativo
Adicionar repositório e instalar manualmente
Para standard corra o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/openSUSE:Backports:SLE-15/standard/openSUSE:Backports:SLE-15.repo zypper refresh zypper install xfce4-panel-plugin-notes