Why can't you change the list of devices in the mode of responsive design?

Good time of day. For a very long time suffering from the problem, can't edit this list in Firefox Developer Edition:
Click edit, put a check mark, removed unnecessary close, but the list as was standard, and still is.
In the settings found nothing in Google as well.
Just does not work simulated touch input. The icon is lit, but pressing the mouse scrolling is not happening. Is the browser on 2 computers, everywhere the same problem.
You may have encountered someone with this disease?
March 12th 20 at 08:12
1 answer
March 12th 20 at 08:14
Zoom out to 90% ctrl+scrolldown will appear below the button is ready!

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