Would be great to have an Always-On highlighting feature; when toggled, text that's selected will be automatically highlighted. It's frustrating when reading a document to have to click Highlight every time the text is selected. This feature is pretty much universal, in Adobe, Preview, OneDrive, and for good reason. Please consider implementing this, it speeds up reading and annotating significantly, and dramatically improves the user experience. It also makes using a stylus, like the Apple Pencil, a better experience, as you don't have to constantly tap the screen with your finger or the pencil after selecting text.