Are you using a high DPI screen by any chance? And what version of Tableau Desktop are you using?
I am using Tableau 2018.1.0 (64-bit). I am going to see if I need 64-bit though. That could be the issue.
64-bit is the correct version. My monitor is a Dell 24-inch HD monitor. It's not a 4k monitor.
And I think this is a Tableau issue. Tableau opens as if it is opening at 150%. Everything is too large. No other program is doing this.
I was able to figure this out, I believe. I had to change the compatibility settings for this program in Windows 10.