gnome-shell-classic from openSUSE:Leap:15.0:Update 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:Leap:15.0:Update/standard/openSUSE:Leap:15.0:Update.repo zypper refresh zypper install gnome-shell-classic
For ports run the following as root:
zypper addrepo https://download.opensuse.org/repositories/openSUSE:Leap:15.0:Update/ports/openSUSE:Leap:15.0:Update.repo zypper refresh zypper install gnome-shell-classic