I ask because recently when I click ctrl alt f2 it crashes on me. My operating system is Windows 10
The information about the user profile can be found here:
Resetting the user profile fixed it
I found mine by the path in LibreOffice! Menu/Tools/Options/LibreOffice/PATHS.
Mine was C/User/Administrator/AppData/Roaming/LibreOffice/4/user.
What also help me is to have LibreOffice make backup copies of all the file used, put in the user file. To do so, Menu/Tools/Options/Load/Save/General, click on “Always create backup copy.