Use your mouse wheel if it has one. Hold down the ALT key to change the angle and rotate your mouse to change the view direction, if you haven't used it already, Cam view can be tilted to ground level for real visual effect and get right in where the bullets are flying about. Click on any team member or equipment such as a jeep or tank and go along for a ride through any engagement.

Thanks for the comment, mate. But I m looking for the opposite: want to see the whole field, like field overview from the very top to manage my units w/o moving camera left and right

Try the mod Blitzkrieg on Steam. It's not in the workshop, but appears on the Steam store for free. It has a much more zoomed out camera max distance.

In your console type
Camera_SetTuningValue(TV_DistMin, x); Camera_SetTuningValue(TV_DistMax, y);
Where x and y are integers representing min and max zoom.

For instance
Camera_SetTuningValue(TV_DistMin, 5); Camera_SetTuningValue(TV_DistMax, 100);
Will pretty much cover the whole map.