Sometimes it is good for visual overview to group checkpoints together. This can be achieved by adding a spacer below a checkpoint. 

Consider the following checkpoints:

Since there are two checkpoints concerning the outer box and two others concerning the inner box, a spacer can be added below checkpoint 2 and 4 to make it look like this:

This will also be reflected in the report, as well as in the mobile app:

To add the spacer, click the checkpoint and check the box 'Add visual space below checkpoint':