1. Click on Image Alignment icon on the left sidebar. User has the option to choose from High (Slow and Robust) and Low (Fast) image feature based Image Alignment from Settings menu. Default setting is high image feature based alignment.
2. This will align all the images in 3D Workspace. User can check camera positions by selecting View Cameras icon given on 3D Work Toolbar . See below, the yellow colour cones are actually displaying camera positions in 3D space.
Note: Camera Icon becomes active once the image alignment process is complete. Watch complete process video below for more details.