FYI the site is now live rather than being on the staging server, so the mobile link would be mortonvisuals.com. Same problem as on the staging server. No menu icon appears in Safari or Chrome browser on my iPhone.
It appears to be selected. https://www.dropbox.com/s/4jq3uncu61k5mvs/Screen%20Shot%202021-06-06%20at%2011.28.46%20AM.png?dl=0