In the review screen the app has a default due date button that allows the quick entry of a due date. By default the value of that button is "+30" which means the due date will be set to 30 days after the invoice date. The paid date offers a similar functionality with the default value being "+1" as shown in the screenshot below.
The default values for these buttons can be configured in the company preferences under:
Company Settings > Preferences > Mark Documents As Approved
For example, you could change the default due date from "30 days after the document date (NET 30) to "20 days after the end of the document month (20 EOM)" as shown in the screenshot above. This will change the behaviour of the default due date button in the review screen.
Clicking the default due date button will now lead to the due date being set to 20 days after the end of the month.