When I start a live Linux Mint Cinnamon 22.1 session the default icon theme in LibreOffice is Automatic (Colibre).
But when I just installed Linux Mint Cinnamon 22.1 the default icon theme in LibreOffice is Automatic (Colibre (Dark)).
Is there anyone here who can explain why there is a difference?
what are you hoping to achieve? If all you want is to change the dark theme to light there is a menu option in LO for that.
It would need analyzing your system, and how the live session is configured (e.g., if it doesn’t set dark mode; or is the LO pre-installed and maybe pre-configured there has a setting to not use dark mode). Really a question to Mint and their live cd.