How do I close a full-screen matplotlib figure?

Question

How may I close a full-screen matplotlib window? I spawned the figure using:

plt.ion()
fig = plt.figure('Optimizer')
plt.tight_layout()
mng = plt.get_current_fig_manager()
mng.full_screen_toggle()

However, plt.close("all") does not seem to do anything, and I couldn't find many things online to try that are relevant to full-screen figures. Seems like the behavior of closing figures differs for full-screen plots?

I have to manually kill -9 the entire script for it to close. (Running on a Raspberry Pi if that matters)

Answer 1

Alt F4 does the trick for me (Ubuntu / Windows). But I have not tried it on a Pi.