In the home page of phpMyAdmin there is a menu item called Font size:
with a drop box next to it containing selectable values initially ranging from 35% very very small fonts to 135% very very large fonts but is very flexible and will go larger or smaller depending on the selected size.
For example if you select 135% the drop box then has a much larger percentage scale displayed for you to go even bigger if you so desire.
Have you tried experimenting with this phpMyAdmin feature?
I have to set mine to 85% to get the text to fit in to my theme.
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