libreoffice-gtk2 from SUSE:SLE-15-SP1:Update project
Select Your Operating System
Add repository and install manually
For pool run the following as root:
zypper addrepo https://download.opensuse.org/repositories/SUSE:SLE-15-SP1:Update/pool/SUSE:SLE-15-SP1:Update.repo zypper refresh zypper install libreoffice-gtk2