I’ve discovered that the axis widget in Studio changes size if you change the camera’s FieldOfView.
This is what it looks like at 70, the default value:
This is what it looks like if I increase it to 120:
and this is what it looks like if I decrease it to 10:
To reproduce this, open a new place in Studio and change the FieldOfView of the Camera to something above or below 70.
I’m not sure if this intentional or not but it doesn’t seem like it would be.