Problem setting motion zones on Doorbell 2

The motion zone setup on my Doorbell 2 is shown over two pages of the app. The first page (step1) shows the 4 zone coverage view and any zone can be turned off if not required. Then hitting the continue button you are moved on to step 2. This page shows a min-max sensitivity adjustment slider. My problem is that being on seperate pages, I cannot move the adjuster and see what changes, if any, are being made. Am I missing something?