As an individual participant, you can’t.
If you want to change zoom properties and resolution, you can try modifying the configuration file at
Consider the following parameters in that file :
// Determines how the video would fit the screen. 'both' would fit the whole
// screen, 'height' would fit the original video height to the height of the
// screen, 'width' would fit the original video width to the width of the
// screen respecting ratio.
LOCAL_THUMBNAIL_RATIO: 16 / 9, // 16:9
REMOTE_THUMBNAIL_RATIO: 1, // 1:1
Also check in
/etc/jitsi/meet/YOURDOMAIN-config.js, there may be other relevant parameters.