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Zoom will permit up to 49 participants in 'gallery view.'  There is a setting in your client where you have to increase the max from 25 -> 49.

Step-by-step guide

Minimum requirements are listed here:  https://support.zoom.us/hc/en-us/articles/201362323-Changing-the-video-layout-Active-Speaker-View-and-Gallery-View-

And instructions for adjusting from 25->49 are given here:  https://support.zoom.us/hc/en-us/articles/201362623