Highlight Tool should allow override to text recognition
Your Highlight Tool tries to be smart by automatically switching from freehand to text select when the document recognizes text. There should be a keyboard shortcut (i.e., hold down Ctrl while using the highlighter tool) to override this and use freehand. Text recognition is buggy and leads to weird performance when trying to highlight recognized text.
Jon Kennedy commented
This would be a much appreciated feature. Currently Ctrl + Highlight highlights all text passing through a rectangular selection area, so perhaps Alt + Highlight should enable user to freehand highlight over text. Currently the only way to do this is to use Acrobat reader instead of Acrobat Pro DC.
Seems like you might have fixed this. Holding down CTRL seems to select all text within the selection area. TY