If Line 5 of the Qualified Dividends and Capital Gain Tax Worksheet in the Form 1040 instructions or line 18 of the Schedule D Tax Worksheet in the Schedule D (Form 1040) instructions is less than or equal to:
$329,850 if married filing jointly or qualifying widow(er),
$164,925 if married filing separately,
$164,925 if single, or $164,900 if head of household.
You can insert up to $19,999 in the foreign sourced qualified box and it will have no effect on the outcome.
Sometimes TT will insist on a minimum amount.