I recently got a new desktop and downloaded SketchUp pro on here. When I went to customising my toolbars it wouldn’t stay to what I changed when I re-open SketchUp. This is very annoying and I can’t remember what I did with my last computer that was different than what I already tried on here. If someone knows how to fix this please let me know!
When you installed did you right click the installer and run as administrator, if you didn’t I would try that first. I don’t know another reason that the toolbars won’t stay.
And the other option, did you close one instance of sketchup with another one open with different settings.
The last one closed will be how the new one opens.
To add to @DaveR above: When you choose the “repair” option, it does just that - repair the installation - it’s not an uninstall followed by a re-install, thus you shouldn’t lose any customizations/preferences/installed extensions.