On the Form 2555 line 26 and line 45 (your foreign earned income exclusion amount) are both positive numbers.
Line 45 says to enter the line 45 amount in parentheses on Schedule 1 Line 21. Then on Schedule1, you subtract your amount from your additional income to arrive at the amount reported on Schedule 1, line 22. See screenshot below.
I am not sure how you can influence this in the online version. However, you will be able to determine whether your foreign earned income decreased your income on your return.
[Edit 04.16.19 | 10:12 am]
