I'm not sure if you can hide the tabs, but you can lock the preferences from being changed.
Just go to (on the main messenger window) Plus! > Preferences > Privacy Protection > Passwords > Enable preferences lock-down.
Hope that helps.
EDIT: Hmm, but that doesn't stop them from disabling logging from the chat window. Sorry
But this may still be a feature that can help in other situations if you didn't already know about it.