Use this command to align gridded samples to selected sample areas. Left-Click with the mouse on one vertex of a sample area, then Left-Click on an adjacent vertex of a sample area. (Hold the shift key while clicking to select the exact point on the map.) Use the Reset Grid Angle command to change the grid angle back to its default setting.
In the example below, the sample area on the left has aligned samples, the samples on the right are not aligned to the sample area: