With a fence present, select the Pattern Area tool (Drawing > Annotate > Patterns).
Click the Fence icon in the tool settings.
Choose the cell or pattern to use.
Enter a data point to place the origin of the cell instances or pattern.
Patterning a fenced area. Left: The pattern cell SPGRID. Right: The pattern cell WOOD placed with the Active Pattern Angle (denoted by "A") set to 30°.