How do I change the position of the Accessibility toolkit tray icon for Shopify store?

Open the app and, in the Icon style section of the Settings page, use the Position dropdown. You can choose Bottom right, Bottom left, Top right, Top left, Top center, Bottom center, Left center or Right center, fine-tune it with Relative position, then click Save. Changing the position requires the Basic plan or above. For better understanding check out the given below video.

Check out this tutorial here

Get accessibility app for Shopify from here Accessibility Toolkit