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Use the in-game interface scaling: Menu -> Settings -> Graphics tab -> UI Scaling (Experimental). I use 1.2 myself on a 1440p ultrawide and it works pretty well. The major downside is that it makes fonts (even more) blurry for some users. Also a minor downside of some scaling issues with icons inserted in the middle of text (e.g., job icons).
Change the resolution the game is at: same menu, change Display Mode to Windowed or Fullscreen and then reduce the Resolution. Makes the text bigger but makes everything else look worse.