The feature has not been removed, just taken out of the standard settings and the American rules. To reactivate it, you would have to switch the game to five or six dice. 

You can do this as follows: 

1. Tap the “Play Offline” button on the main screen of the app. 

2. Tap on the gear icon in the upper right corner. 

3. Activate the options "Category 1 Pairs inactive" and "Category 2 Pairs inactive" by tapping the slider to the right of it. 

4. Select the number of points.