Change fonts of Tabs in a flap

My image is 3.9, but the problem is: I can not find how to chang tabs (items in flag) fonts, not the flag font. I am new to Squeak, and my screen is 1280 X 1204, then I change system fonts to make it proper for me, I can change fonts of flag, but  can not  find  how to changs fonts of Tabs (items in a certain flag). Help me ! 

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