The active window solution doesn't work for me. You need an interactive solution to do it quickly.
I have attached a GD video where I clearly show how I want the script to do it. That is, without any windows you can quickly reduce the FOV and then quickly return it back.

https://drive.google.com/file/d/1r1UDO2dwU1083vV03Z1zPNPq9_MoEQWE/view?usp=sharing

Hi Moi3d fan, something like this on a shortcut key maybe? :

script: var vp = moi.ui.mainWindow.viewpanel.getViewport('3D'); if ( Math.abs(vp.fieldOfViewAngle - 27.5) < 0.01 ) { vp.fieldOfViewAngle = 7; } else { vp.fieldOfViewAngle = 27.5; }

- Michael

Yes! That's what it's all about. Thank you!

And can the camera focus on the cursor position?

Hi Moi3dFan,

re:
> And can the camera focus on the cursor position?

Sorry no there isn't any way set up for field of view changes to focus on the cursor position.

- Michael