The usual cause is viewport clipping in Blender: the scene is too large for the current view range, so objects vanish when you zoom out.

How to fix it

  1. Press N in the 3D Viewport to open the Sidebar.
  1. Open the View tab.
  1. Increase Clip End if objects disappear when zooming out.
  1. If they disappear when zooming in instead, lower Clip Start.

Camera vs viewport

If the problem only happens in Camera View , adjust the camera’s own clipping settings in Object Data Properties > Lens rather than the viewport settings.

Extra fix

If the scene scale is extreme, try selecting the object and pressing Numpad . to frame it, or scale the scene down so Blender’s clipping range fits better.

In one line

For your case, the most likely fix is: increase Clip End in the 3D Viewport.