Closing Maximized Dictionary?

Older Paperwhite

This is driving me crazy (admittedly a short trip) and I hope someone knows the answer.

I routinely report typos through the Kindle when I find one. The dialogue box for reporting a content error also has a line for opening the dictionary. Every so often, I fumble-finger things and accidentally press "open dictionary".

The problem is that it opens maximized, meaning filling the entire screen. I cannot figure out how to close the dictionary to get back to my book. The only thing I have found that works is to reboot the Kindle, which takes a really long time.

Anyone know how to close a maximized dictionary?