SUMMARY This is subjective, but the large symbolic icons look a bit out of place. Maybe the labels could be converted to tooltips and the icon size reduced a bit? And to save space they could be aligned horizontally above the panel. STEPS TO REPRODUCE 1. Open Okular 2. Open navigation panel 3. Notice large symbolic icons OBSERVED RESULT It looks a bit off. EXPECTED RESULT They should have the same size as the icons in the toolbar. SOFTWARE VERSIONS (available in About System) KDE Plasma Version: 5.13.4 KDE Frameworks Version: 5.48.0 Qt Version: 5.11.1
Select "Small Icon" in the context menu of the navigation bar and then these icon have the same size as the icons in the toolbar