Thanks for the command. I made a quick and dirty “Addon” to persist the setting after reloads etc.:
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Go to C:\Program Files (x86)\World of Warcraft_retail_\Interface\AddOns\ and create a folder
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Go into that created folder and create 2 files (Name.lua and Name.toc). U can choose the name u want
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Edit the Name.lua and insert: GameMenuFrame:SetScale(0.8)
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Edit the Name.toc and insert: InGameMenuScale.lua
Save the files and reload ingame. The game menu should be fine now