The message header toolbar used to include text, e.g. "reply," "reply all," "forward," etc. Suddenly (perhaps with version 91?) it only shows icons. Please bring back text! The icons are so teeny that they are hard to use with a touchscreen. I have a physical limitation so that I can't use a mouse easily. Plus, I always have to pause and think which arrow is which, whereas with text, I can just read it. Text is faster! Text is more user-friendly! There is an add-on that will restore text (it's called "message header toolbar customize") – but the comments indicate that it does not yet work with version 91.