Simply changing the zoom is not the answer, because it will push text out of the frame without giving a horizontal scroll bar. The only way I have gotten the font to increase with the Accessibility Block is by starting the AT Bar and then using that to increase font size.
We have small Chromebooks for use, and for some students, it is beneficial to increase the font size. If I were to set the font size larger when I make the lesson, then the scroll bare is there. The benefit of using the Accessibility Block to increase the font size is that the font is increased, but it wordwraps so that there is no need for the scroll bar. Having to use a scroll bar is a nuisance on the Chromebooks, because each lesson page is taller than the screen, so a student would have to read a line, scroll down to the bottom, move the bar over, scroll up to finish the line, then scroll down to move the bar back so they can continue on to line 2.