South America:
Div 1 and Div 2 (strongest leagues): Argentina, Brazil, Ecuador
Only Div1: Chile, Uruguay, Colombia, Peru, Bolivia, Paraguay
Not loaded (weakest league): Venezuela
Europe: (same logic, using UEFA coefficient, Div1+2 for the strongest leagues, then only Div 1 for some other strong leagues, and the rest are not loaded)
Div 1 and Div 2: Germany, Spain, France, England, Italy, Netherlands, Portugal
Only Div 1: Austria, Belgium, Czech Republic, Cyprus, Croatia, Denmark, Scotland, Greece, Israel, Norway, Serbia, Switzerland, Turkey, Ukraine
North America:
Only Div 1: Mexico and USA
Africa:
Only Div 1: Egypt
Asia:
Only Div 1: Saudi Arabia
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I like to manage in different teams/countries in the same save, so I tried to make a balanced and realist world (as far as my computer can handle), I resigned Asia and Africa (loaded one league from each continent so they can have some strong representation in the FIFA Club World Cup, also Saudi Arabia has a good transfer activity), NA I think it's pretty well covered with only loading Mexico and USA, SA and EU are very complete in my opinion.
Custom DB where I load international players, players from top clubs, with cont. rep., and from club in cont. competitions from every country (155k players)
Default Details, I didn't touch that.
I don't have any "View only" league.