Created attachment 187413 [details] difference in themes demo (above: left window active, below: right window active) SUMMARY Okular (as well as other KDE-Apps) via apt uses the the Gnome Adwaita Top-Bar instead of the Yaru-theme one. This is a bit of a visual hiccup and negatively impacts Okular's integration for Ubuntu STEPS TO REPRODUCE 1. download and install okular via apt 2. open okular OBSERVED RESULT Gnome Adwaita-themed top-bar EXPECTED RESULT Yaru-theme top-bar SOFTWARE/OS VERSIONS (available in the Info Center app, or by running `kinfo` in a terminal window) Linux/KDE Plasma: Gnome KDE Plasma Version: Gnome 49 KDE Frameworks Version: - Qt Version: - ADDITIONAL INFORMATION This is for the apt-versions (not snap!!)