Hi DuNa
Step 1: Find the button that says "Override OFF" in the right-bottom corner of your LR Window (the little light/dot should now be green and the button says "Override ON"
Step 2: Click on the gears icon which brings up the "Edit Override Settings" Window, then click on the Advanced tab.
Set 3: The left-hand panel (WORD SLIDE) has an item called "Font size", click that red dot button (which should now be green) and select your preferred size from the dropdown list. Remember to save.
Hope this helps
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