Can’t adjust the time – Newton - Addition and Subtraction Review

Item: Newton - Addition and Subtraction
Rating: 5
Author: Bps165

Can’t seem to adjust the time as is featured in the screenshot in the AppStore. I’m using iPhone X, iOS 11.2. A second the other reviewers request for a more adjustable timer (though would settle for at least the options advertised).
Review by Bps165 on Newton - Addition and Subtraction.