Specify a point displayed in the first layout viewport. Specify a second point to determine a construction line for the alignment.
Choose a point that can be aligned with objects in the second layout viewport. Use object snaps for precision.
Click
Home tab
Modify panel
Move.
Select the layout viewport to align to the first layout viewport. Press Enter.
When prompted for a base point, specify a point in the second layout viewport. Choose a point that corresponds with the point selected in the first layout viewport.
When prompted for the second point, hold down Shift and right-click. Click Object SnapPerpendicular.
Click the construction line you created.
The objects displayed in the layout viewports, are aligned.