First of all, go to Zones -> Counting:
Add 2 different zones, one for Counting and another for Walkby. Name the walkby zone as walkby
Draw the pass line for walkby as a slanted line instead of straight line
Go to Calibration and enable Couples Counting
Go to Settings -> Tracking and make the following changes:
Basic -> Height Filter - 60
Segmentation -> Min Height - 50
Tracking -> Min Height to track - 60
Tracking -> Min Object Mass - 150