gnome-shell-classic from openSUSE:Leap:15.2 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:15.2/standard/openSUSE:Leap:15.2.repo zypper refresh zypper install gnome-shell-classic