iPhone XR incompatibility – 30 Day Firm Butt Challenge Review

Just got a new iPhone XR and had to delete all of the 30 day workout apps I was using. Calendar size is way too big and there’s no way to access the days to complete the challenge. Can’t y’all fix this? I know I’m not the only one with this problem, there are other reviews here with the same issue. ?
Review by Boxcarlily on 30 Day Firm Butt Challenge.