Set endpoint markers
Add or remove a marker at either end of a supported open path or annotation.
Endpoint markers are style properties, distinct from a North Arrow object or the pointer shape of a callout. The controls appear only for object types and endpoints that support marker editing.
Select the intended object
Select a line or supported open path, or an annotation with editable markers. Closed filled shapes do not offer the same endpoint controls because they have no open start and end.
Choose each end separately
Use Arrow Start and Arrow End in the supported outline properties. Choose None for an unmarked end or select a marker shape. The start and end do not have to use the same marker.
Adjust marker size
When a visible marker is present, use Arrow Size to change its size. This is a separate style value; do not assume that changing line width automatically produces the marker size you need.
Check the result at the intended view and output
Inspect the marker direction, line weight and label readability. Reversing a path can exchange which geometric end is considered its start. Dimension-specific annotation controls can have their own size presentation.