What is the maximum number of countries that can leave the XCOM project at the end of the month?

Solution 1:

In the ini files, there are the following settings:

PANIC_DEFECTIONS_PER_MONTH_EASY=1
PANIC_DEFECTIONS_PER_MONTH_NORMAL=2 
PANIC_DEFECTIONS_PER_MONTH_HARD=3 
PANIC_DEFECTIONS_PER_MONTH_CLASSIC=8