Normal icon sizes.
Enlarged icons.

sudo apt install git meson sassc libglib2.0-dev libxml2-utilsgit clone https://github.com/ubuntu/yarucd yarugit checkout 20.04.5meson buildcd buildsudo ninja installgit: 20.04.5
Thanks!
it looks like you have the wrong version of Gnome shell
that old system menu is no longer having the round buttons and is instead a menu button so upstream and we don't style it anymore
could you check which version of gnome shell you use?
user@laptop:~$ gnome-shell --version
GNOME Shell 3.34.3
user@laptop:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 19.10
Release: 19.10
Codename: eoan
user@laptop:~$ uname -a
Linux laptop 5.3.0-46-generic #38-Ubuntu SMP Fri Mar 27 17:37:05 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
user@laptop:~$
Hi @lgg, tag 20.04.x are not supposed to work in 19.10 because the gnome-shell version is too old (you'll need version 3.36)
@clobrano thank you!
Most helpful comment
Hi @lgg, tag 20.04.x are not supposed to work in 19.10 because the gnome-shell version is too old (you'll need version 3.36)