Most video conferencing applications, such as Zoom, Google Meet, and Microsoft Teams, automatically set the resolution to 360p(480x360) to prevent high latency. If you need to present a clear document for your online classes in Zoom, here's how to do it:
Step 1. Launch Zoom and click the gear icon on the top-right corner.
Step 2. Under Settings, go to Video.
Step 3. In Video > Camera, select OKIOCAM from the drop-down menu, and check the box for HD.
Here's the difference in video quality before and after the setting: