How to hide the grey box on the top left side of the image, when using Local Adjustement

When using local adjustment tools, I have a grey box on the top left corner of the image (saying that I am using this tool). Most of the time it’s not a problem, but some time to time, I would prefer to get rid of it, because it’s over something I would like to work on (i.e., a cloudy sky I need to retouch).

So, I know than pressing E allows hiding the local adjustment sliders, but how can we hide this grey box?

Keystroke, “i”.