CADWorxP&ID tab: Text > Medium 
Arrows toolbar: Medium
P&ID menu: Arrows > Medium
Command line: MEDIUMARROW
Places a medium-sized arrow on the next vertex of the selected process line. Arrow size is specified by the ArrowMediumSize variable on the Configuration File dialog box. For more information, see Configuration File Dialog Box and ArrowMediumSize.
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An arrow contains no other data other than the graphic displayed on the drawing.
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If an arrow is not placed on a process line, you must select a rotation direction.