There is no way to customise or at least have the reports listed as "Favorites" display an an organized manner. It appears the reports appear in the order they have been added as favourites which makes them different across every file as they get added in at different times.
An enhancement should be introduced to list them in alphabetical order so they are all ordered the same across all MYOB files given the generic name of the reports.
A further enhancement would to have the favourite reports be shown when you hover over the menu item Favourite Reports. This would save you having to go into the next screen and then try and find the report.