Nope. You would expect this to be both a country-setting and a user-account setting. Defaulting to the country-setting if the user has not set its own preferrence. But alas, no. Apparently Mendix choose to stick to 1,234,567.89.
More people have run into this: https://forum.mendix.com/link/questions/108417
Please use the below widget i hope this is useful for your requirement. Grouping digits in format (1,23,45,678.00)