Per user height

i have a scheduler where they can add a dynamic amount of scheduled items. i made it max height. but some people who have 3-4 schedules have a lot of dead space, im solving it currently by maintaining two versions of the app. “count down XL” and “count down LT” it would be nice if we can just set it per users where they can choose within the app an option and then our app adjusting the height to what they expect. i wouldnt do many heights id probably do 3 500px 190px and then something in between.