zoom

I don't understand what's changed but I can't select some geometries with osnap anymore, using the zoom in the drawing I have a machine and I have to change the shape of some 32 mm sunshades connect them to another axle slightly slapped down, so I have two circumferences that intersect but with...

Hello, everyone. I beg you to learn how to use rhino. . I built my model but after importing a new object, I press the "zoom extends" command to find it but suddenly the program slows down and the model disappears and I can't find it. . . What do I do? ? ? Thank you.