Zooming out does not return to original fisheye 180 degree screen.

Good day Sir!

I have a concern on the zooming in and out of objects during fisheye projection. I realized that after I zoomed in on a particular target with “/”, and furthermore with “Pg Up”, I cannot return to the original 180 degree field fisheye whole image projection upon zooming out with “Pg Dn”, without having to adjust the mouse to “pull down the image” to make it circular again. Is there a problem with my copy of Stellarium, or by default it will only return to 60 degrees image?

I am using Stellarium on a planetarium inflatable dome, and zooming out to return to the original 180 degree fisheye requires me to “mouse down” to adjust to the desired image again.

Is there any more convenient way of having to avoid pulling the entire screen down? It can be a bit annoying to the audience inside the dome when I have to do what seems to be automatic for the software to go back to the original whole sky image.

Please advise, I believe I missed something very important here. Maybe there is adjustment on the default settings, or other configurations?

Kind regards,
Allen