Struggling to read Nastaliq on mobile apps: should I switch to a print-friendly font?

I’m an absolute beginner bouncing between apps, and I’m finding that the way Nastaliq renders on my small screen is making it impossible to distinguish between certain letters like 'dal' and 'zal'. The typography keeps changing between apps and it’s throwing me off entirely. Is it better to stick to one app to get used to the digital font, or should I print out basic Urdu text to practice reading in a standard font first?