Zoom Rotation > Align Horizontally, Point - Point (Manage Menu)

This command aligns the rotation of the current drawing window's contents to a line defined by two points so that that line is being displayed horizontally.

The first point through which the line should run can be entered by clicking the mouse anywhere in the drawing.

The second point through which the line should run can be entered by clicking the mouse anywhere in the drawing.

After the line has been entered, the rotation of the current drawing window's contents will be aligned to it.

These alterations to the zoom rotation and the visible section can be undone with the Zoom > Previous View command.