Yeah, Stage is technically a "box" and most "boxes" are entered in the output column (other exceptions like SG include ISG, DLBL, BLK, SBR, INT, et.al.) that are actually displayed on the power rail. We do not have a cursor position for the power rail, so you can initiate it via the keyboard with the cursor in the output column.
One of the reasons these are displayed on the power rail is that they metaphorically, sort-of, take over the power rail, are used as a delimiter, and/or make the power rail non-functional (e.g. DLBL Data Label w/ACON and NCON data "instructions").