Visualize in 3D
Use your mouse and the commands included in the View ribbon:

Drag the mouse to rotate.
To use a specific branch as the rotation axis, use the pivot point.
- Click the icon.
- Click the desired branch to assign the pivot point to that branch.
- Drag the mouse to rotate around the new pivot point.
To spin a stack that was saved in an improper orientation, click the 2D rotation icon then drag.

Scroll the mouse wheel to zoom in and out.

To shift in 3D view, hold down SHIFT and drag the mouse.
To shift using one of the projection views: drag the mouse.

It is likely that the vessels you can't see have a very thin diameter. When you zoom out in 3D, the diameter might be too small to be visible.
To display the vessels:
- Select the vessels from the Traced Structures panel on the left.
- In the View ribbon, click the Thickness button to select the option. The vessel will show as a centerline instead.