@ArnaudChougny You also did not provided the link to page where you would like to do this, so we can give you the css that works on our end but we can not guarantee it would work on your side the same.
#overlay-menu ul li a { font-size: 24px !important; }
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please send us link to page where you want to do this first.
I have the same question, how can i change the font size of the Overlay Menu?
Thanks!
#overlay-menu ul li a { font-size: 24px !important; }