This function displays a custom tab in the chat area, which will replace any other custom tabs that might be showing. It takes a name, description, and options. The name parameter is the name that will be shown on the tab itself. The description will be displayed below the tab in a wider space. The options object may contain a size field, which is a decimal between 0 and 1 indicating the size you wish the canvas to be, with the default being 0.5, for example: