How to remove PR comment window

I've opened this window by mistake by clicking `+`.
I don't want to add any PR comment, so how do I remove this window? I don't see a minus button.
I've clicked it a few times on other lines, and now I have a bunch of these things on many lines, and I don't know how to remove them.
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I also experienced this in the exact same scenario. I accidentally opened one when trying to click the gutter to set a breakpoint, and then a second one to confirm it was the plus icon that did so. Now I have two empty comment boxes just disrupting the code I am trying to debug through, and seemingly no means of removing them.
Pressing ESC while in the comment textbox will discard the comment and remove the embedded window.
I encountered the same issue. I ended up writing something like a period/dot > leave a single comment > delete the comment