Hi Jayant, Elaine was faster at answering this. I'll send my description anyways since it has a few more step-by-step details. The molecule and map go out of view because of front and back clip planes. These are always enabled in Chimera and the normal remedy is to move the front clip plane forward, and back clip plane back further so no clipping occurs. To do this use the Side View dialog shown with menu entry Favorites / Side View. The two vertical yellow lines represent the two clip planes in this view from the side of your data. Drag the yellow lines with the mouse to move the clip planes. The square at the left represents your eye and the left vertical line is the front clip plane, the right one is the back clip plane. Tom