Set a separator for the border between the integral and the fractional parts of a decimal numeral. You have two options: decimal dot (3.14) or decimal comma (3,14). You can't choose dot/comma for both the decimal and thousands separator.
Set a thousand separator. You have three options: dot (10.000), comma (10,000) or a space (10 000 ). You can't choose dot/comma for both the decimal and thousands separator.
For each type of results (counts / percentages / numeric statistics) you can dictate different format that consists of a number of decimals (from 0 to 4) and use of a thousands separator (yes or no).