plasma5-workspace from home:ftake:branches:openSUSE:Backports:SLE-15-SP5:Update project
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Add repository and install manually
For openSUSE Backports SLE-15-SP5 Update run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:ftake:branches:openSUSE:Backports:SLE-15-SP5:Update/openSUSE_Backports_SLE-15-SP5_Update/home:ftake:branches:openSUSE:Backports:SLE-15-SP5:Update.repo zypper refresh zypper install plasma5-workspace