I changed several defaults in LO 6.0.4. I use Writer exclusively, so I don’t how much my stupidity affected the other apps in the Office Suite. I screwed up very badly. I need someone smarter than I am to tell me how to restore everything to the original defaults that I downloaded. Uninstalling and re-installing doesn’t change my screw ups.
To get rid of all the personal settings you made, including templates you probably created and scripts (user code) you wrote or imported, you can reset the user profile. See this wiki page for the details.