There are three Markups Tools available in PlanSwift 10: Arrow, Box, and Pen (line).
You access these tools on the Home Tab by clicking the “Markups” drop-down.
You can set color before selecting a Markups tool - all markups drawn use the selected color.
You can always change the color after drawing a markup, see: /wiki/spaces/PSUPPORT/pages/298516652.