Are you referencing the try me in the broker UI?
The “try me” tab in Solace Cloud Console allows you to set the message type to “byte” or “text” (directly above the Publish button, see screenshot below) however it looks like the broker integrated “try me” doesn’t offer that option.
If you are not using solace cloud you can get hold of the “try me” code on codepen:
https://codepen.io/solacecloud/pen/bxdrbL
