The prototyping mode has disappeared

Hi, ​@Дарья С 👋 Thanks for flagging this — let's try to narrow it down.

A couple of quick things that would help:

• Could you share a screenshot of your canvas, including the toolbar at the top and the right-hand panel? That'll show us exactly what state the file is in.
• Can you check whether you're in Dev Mode? If so, try switching back to Design and let me know if the Prototype tab reappears.

Let me know what you find and we'll go from there! — Jaycee

There's only the design tab. But in the browser version, everything is as before