To install the Yaru theme properly on openSUSE, we need to compile a few files first and to do so we require a few tools.
sudo zypper in git meson ninja glib2-devel sassc
Once we have the tools installed, we clone the Yaru theme project from GitHub.
git clone https://github.com/ubuntu/yaru.git
Next, we build the theme & install it.
cd yaru meson "build" --prefix=/usr sudo ninja -C "build" install
The Yaru theme will then be available for selection from the GNOME Tweaks configuration tool.
Select Yaru as the Applications, Cursor and Icon themes. You may also select it as the sound theme as well if you want.
Lastly, enable the Dash to Dock extension for GNOME and you should have a polished desktop.