There used to be instructions on how to format questions, which included such things as it displaying the compiled mwe. Are the instructions still available, and if so, how??
You can find instructions in the help center: How do I format my posts using Markdown or HTML?
Furthermore, there's a question mark button at the top right of the editing window, when you write a post. Click it, and you get a help menu where you can click a topic (links, images, lists, code etc.) And if you click on Advanced help, you get a Markdown editing help overview.