plasma5-workspace from openSUSE:Backports:SLE-12-SP3 project
Select Your Operating System
Add repository and install manually
For standard run the following as root:
zypper addrepo https://download.opensuse.org/repositories/openSUSE:Backports:SLE-12-SP3/standard/openSUSE:Backports:SLE-12-SP3.repo zypper refresh zypper install plasma5-workspace