It's not a default but I just changed it to tabbed view in the settings, picked Sifr icons in the settings, and installed adw-gtk3 theme on GNOME which makes gtk3 apps blend more with the default libadwaita GNOME theme.
Idk, LibreOffice UI seems pretty decent for me.
It's not a default but I just changed it to tabbed view in the settings, picked Sifr icons in the settings, and installed adw-gtk3 theme on GNOME which makes gtk3 apps blend more with the default libadwaita GNOME theme.