Hello @JuliaT088 ,
Using our design tab that is located in the top left corner while within your draft email, usually it’s defaulted to the build tab view. Design will be the third option within the campaign editor. Starting at the global level is the quickest way to apply text styles, but you can also update individual blocks with different styles for contrast or emphasis if you like. I have attached a article that discusses more on the design tab here.
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