Q1: If I think the ghost view is better than render view, how can I export the images without the center gird?
Q2: When I use “Animate” to generate the drawings, it seems only one key slider is changing. Is it possible for several sliders changing simultaneously?
Parametrics 
On Rhino Command grid and just turn off all the center points and grids. then you will just be left with what you are working with and the background