This is quick video about how educators can instruct students how to make adjustments on Zoom to decrease the required bandwidth if they are having a slow connection. There may be more ways to further help the issue, but this is a start.
Instructions for student:
Enter full screen by clicking the view tab on the top right and selecting full screen
Click view again and select "Speaker View" or "Standard"
Then click the "minus" sign in the window with the video thumbnails
Used screen recorder by Animotica and Zoom meetings.