Re: Greyed out 'Manage Worlds'
That message is correct at the main menu screen as you haven't loaded a save. You need to start a new game as prompted top right of the menu.
Please open Terminal and copy and paste the following search command then hit Enter/Return:
find ~ -type d -name "*The Sims 4*" 2>/dev/null
After a little while it will return the results of the search. Please copy and paste the results in a post here.