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.
Katharina shared this idea
Resolved (Comments Open) · Ashutosh Chaturvedi responded
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.