I use a macOS High Sierra 10.13.6 and I try to “Compile and View” a text with TexStudio 3.1.1 but the program crashes and quits when the PDF Viewer is selected to be embedded in the app.
I must say that the functionality of “Compile” works fine, as well as “Compile and View” in external PDF Viewer. However, I am interested in having the preview inside the app since it makes the workflow smoother. I tried everything I could and followed the proposed solution of installing older versions of TexStudio (2.12.22). Unfortunately, none of them solved my concern.