When creating a new assistant using the “Assistant” tab, the right side window will open:
If you expand the “Instructions” section and add some content. If you use your mouse/cursor to selected the text and you cursor goes outside the sidebar window, it will close the create window completely and you will lose whatever you have typed.
The sidebar window (drawer) is not persistent and closes when clicked outside of it (anywhere on the backdrop), which is easy to do by accident.
This will also occur if you completely fill out all the inputs for the assistant then accidentally click outside of the sidebar.
Ensure the sidebar window persists and only closes when “cancel” or “save” is clicked.