Annotation "draft" bar across bottom of screen

ManMadeMath
When writing an annotation on a pdf document, sometimes when I hit the backspace key to delete something, this bar at the bottom of the screen opens up. Anyone know what it is and how I can stop it from opening to begin with?

https://s3.amazonaws.com/zotero.org/images/forums/u21598524/9k6kkagqnfoa9jdvgauo.png
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