When playing in 4K resolution, the tech tree/research screen is super zoomed in/large, even at farthest zoom out level. UI scale may play a role in this as well, since at 4K I run the UI at 160% size to be visible from the couch. See attached screenshot, it is zoomed all the way out. Switching to 1080P resolution and 115% UI scale works around the problem.
Set resolution to 4k and UI scale to 160%. Build research station. Check tech tree.