I started using VS Code recently to do some of my work (in addition to good old Visual Studio and JetBrains Rider) and I have been configuring it step-by-step to the way I like to work.

One of the first things I set up in my text editors is larger font sizes (20px and higher), for ergonomic reasons, as my eyesight is not what it used to be. VS Code comes packaged with quite a small default font size (not to mention really small UI font) and I guess this is acceptable for the younger generation of programmers (although I don't think it is a healthy lifestyle).

A few years back I started to follow Kevlin Henney's suggestion (by the way, you should really watch it:
Seven Ineffective Coding Habits of Many Programmers) of keeping the source code lines up to 80 characters wide. So I made a rule to use the largest font size that would allow me to see the full 80 character columns plus enough leftover space for a sidebar window on a laptop-sized screen:

My VS Code look

While the large font is fine for code editing, I like to use smaller text for ancillary stuff like the Output window. Although VS Code (unlike Visual Studio and Rider) does not provide a direct way to set the Output font size through its GUI, you can specify it in settings.json configuration file by adding a separate [Log] section:

    "[Log]": {
        "editor.fontSize": 12
    }