When replacing formatted text in a text box, keep the formatting. Right now, selecting and replacing specially formatted text reverts it to the formatting set for the box overall. Ex. if I start typing to replace "Other features," it loses its italics.
To get around this, you have to click into your existing string, type your new string, and then delete the portions of the old string preceding and following the new string, or reapply your formatting every time you replace words -- not the most intuitive or convenient; replacing formatted text with the same style would help.