The new release of the firmware (13.22) scales the heartrate range between the min and max values for the current 4 hour period. I see why this was implemented but it's definitely not as useful for me and I'd prefer to go back to a fixed range.
Having the option to set a fixed range is better because then at a glance I can compare my heartrate to previous observations. If it has this dynamic range the scales between min and max it takes longer to figure out what the data means as I need to adjust my assessment to a different scale each time I look.
We need to have an option to switch to a fixed scale (50-200 or something)