When you are in Curtain Wall Editing Mode in the 3D Viewpoint, you can select all those Frames you do not wish to see and set them to the "Invisible" Frame type. Then no Frame geometries will be displayed for them.
About the other question: I guess you mean that you would like to have the ability to specify the number of grids, let's says 5, and if the Curtain Wall is 5 meters wide, they will be 1000 mm apart, if you increase its width to 6 meters they will be 1200 mm apart automatically.
Unfortunately such automatic repositioning of grids is not available.
But you can redefine the grid scheme at any time for any already placed Curtain Wall.
Loving Archicad since 1995 - Find Archicad Tips at x.com/laszlonagy
AMD Ryzen9 5900X CPU, 64 GB RAM 3600 MHz, Nvidia GTX 1060 6GB, 500 GB NVMe SSD
2x28" (2560x1440), Windows 10 PRO ENG, Ac20-Ac28