The following screenshots show the player located at two different positions, on the same zoom level. Note the visibility of the personal roboport range in one while it's not visible in the other.
On the first image, the range is only visible on zoom <= 0.610
Player location -161, 104

On the second image, the range is only visible on zoom <= 0.552
Player location -162, 104

Player location -117, 125
On the third image, the range is only visible on zoom <= 0.410

I play on a 1618x1050 window, so 1595x1050 game view. I have the UI scale at 0.75.