are you able to link to the github repos for each of these ?
We have provided a version of the UI toolkit that includes gallery view. Whether or not SharedArrayBuffer is enabled is controlled by the web server. You can refer to this article for detail.
what is the reason someone would want to disable SAB? is this just for mobile and or non-chromium browser testing?
It depends on the customer’s application needs. Enabling SharedArrayBuffer requires additional settings and has some usage restrictions. You can refer to the MDN documentation for more details: SharedArrayBuffer - JavaScript | MDN.