First locate the position of the camera (Longitudinal). For this, use "freeinternal cam". This setting is an option located at the upper left menus (can't recall witch one exactly). Once you set it, you will see some small numbers at the bottom left of the screen. When you pan or zoom the camera, those numbers move. There are 4 groups of numbers; left, up/down, longitudinal (zoom) and panning, Select the one that zooms up to the place where you want to be near or pass the windshield glass. Note ALL the numbers on a paper. Close everything and open the config file of the interior of the particular loco. You have to do this in the interior file! Once the config is open for edit in explorer, look carefully and you will see a group of lines under camera heading with groups of numbers separated by commas, the numbers show the position of each camera at the loco. Find the line that correspond to the longitudinal position of what you want to modify and change the numbers. By this method I have reposition most of the cameras in my locos. Slight variation of all this allows for changing the height of cabs when they are wrong from origin. You'll have to play several times with all these points as I did to get the gasp of what each thing does, but it works pretty well.. I wish N3V would have a tutorial on all this.
On this, you are moving the camera. The way you tried to do it, was just moving the zoom, and as you discovered, it does not work.