You set decimals in the Traverse View via View, Format View, Decimals tab. These affect the decimals displayed in the Traverse View and printout. See https://traverse-pc.com/WebHelp/topics/ts-format-decimals-dialog.htm
You set decimals in a drawing, primarily via Traverse Drawing Settings, Decimals button, located near the bottom. See https://traverse-pc.com/WebHelp/topics/qv-labeling-traverse-lines.htm