Thank you for posting in the Zoom Developer Forum ! First, please try testing with the latest version of the Web SDK. You can test using our Sample Web App 2.8. 0 to confirm if you see the same issue. There have been multiple bug fixes since your version of the SDK.
Also, can you share if you have enabled SharedArrayBuffer r array for your site? If SharedArrayBuffer is not enabled, only Self and Speaker View will be available in the Web Meeting SDK. Please see our support documentation which images of how the view will look with and without SharedArrayBuffer enabled :