"Layout" Tab is Missing from the Top of Musescore

I am missing the button that says "Layout" at the top of my screen when working in a score. I used this tab just last week to change note font size by adjusting the scale. I'm running version 3.5.0.28537 on Mac iOS Catalina 10.15.6. The whole tab appears to be just gone and I can't get it back. I feel like I'm losing my mind and I need to make the font size of the notes larger for an elementary Zoom music class tomorrow night. Going into "Format" -> "Style" -> "Sizes" and adjusting the percentages of the sizes of the various parts of the score appears to change nothing in how the score is rendered on the screen. Please help! Thanks in advance!