I am studying autocad and on one drawing I encountered acad_proxy_entity. I can't change anything for her. Is it possible to change it into something more malleable, like a polyline?
acad_proxy_entity is an object that was created by non-standard autocad tools. You can blow it up (dismember) and it will be converted into AutoCAD primitives. If there is a lot of acad_proxy_entity in the drawing, you can use the aectoacad command