The default reference should not be changing in size, it might have something to do with your model, is your model measured in a different unit that's not metres?
When I open the program, this is how it looks. I completely understand that the model itself could be the wrong size, either too big or too small, but that’s not what I’m referring to. I’m specifically talking about the program’s default template. When I open the program without importing anything, the default template is already extremely large. I can import my model afterward and check its size, but my question is why the program’s default template itself is so large.