You can reapply a floor span direction symbol if it has been removed from the structural floor.
When you place a structural floor, a span direction component is placed in plan view along with the structural floor. Deck span direction is designated by the direction of the filled half-arrows.
Click Annotate tabSymbol panel (Span Direction).
(Optional) To automatically place the tag, click Annotate tabSymbol panel (Span Direction) (Auto Place). The first click on the floor or slab automatically places the tag at the center of it.
To manually position the tag, toggle off Auto Place, then click once to select the floor or slab, and click again to place the tag.
Move the cursor to the desired location on the structural floor and click to place the direction span.