I don't have a problem with highlighting, but the frequent interpretation of swiping up or down along the left edge is frequently misinterpreted by Kobo Libra as something other than an attempt to change brightness level. If the margins are narrow, then it can easily be interpreted as an attempt to highlight the text nearby. It's also frequently interpreted as a tap somewhere in the center to bring up the page guide and top menus. I have about a 60% success rate with actually varying brightness by swiping along the left edge. 40% of the time those other things happen when I don't want them to.
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