Udemy automatically optimizes video resolution based on your internet connection speed, but the video quality can be adjusted at any time by clicking on the gear icon in the bottom right-hand corner of the course player. You can select resolutions of 360p, 480p, 720p and 1080p (if available) for the video quality.
Improving Screencast Lectures
If you're having difficulty viewing text on lectures where the instructor is sharing their screen, try adjusting the video quality.
For steps on how to adjust the video quality while watching courses on Udemy's mobile app, please click here.