Why does mac switch program windows by itself?

Question

macOS

In general, the problem is the following - I'm sitting code. Suddenly, the system abruptly switches from the editor to Photoshop, while the editor is active (that is, I see the Photoshop window, but if I continue to type, characters will be entered in the editor). Such a strange nonsense is happening ... How so? And how to deal with it?
This happens with Photoshop. That is, throws on photoshop. I haven't noticed this with other programs.

Answer 1

So far, only one thing has helped - expand the code editor to full screen and switch to Photoshop at the right time. Principle while there is no second monitor - norms.