May I know the OS and software version and edition (Pro / Standard / Lite) you are running?
Apologies, I forgot to mention that it is Quartus Prime Lite Edition v19.1 running on Windows 10.
Close the report and then from the Processing menu, select Compilation Report. Or there is a toolbar button to reopen it.
Have you tried sstrell's suggestion?
For more complete information about compiler optimizations, see our Optimization Notice.