Edit: apologies, misinterpreted the question. When you say it doesn’t work, do you mean you cant even click the button?
Edit 2: Ah I think I know your “problem”. It is actually working fine. You are reloading the same level you already have open, so it looks like nothing is happening. It is in fact opening the level. The problem is you need to clear the widget from the screen after pressing play. Add the following function: “Remove all widgets”. This clears ALL widgets from the viewport. If you want to only remove 1 widget, you need to save a reference to it in a variable, then use “Remove from parent” instead.