User Interface zoomed in
The interface in my Adobe Illustrator 2019 is 'zoomed-in' and it's not the same size as other Adobe apps. I've attached a screen shot of Illustrator 2018 vs Illustrator 2019.
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Katharina
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Illustrator has a feature to scale user interface on high resolution devices. You may choose to turn it off under preferences>User Interface>UI Scaling.