A port's text orientation refers to the direction in which the abbreviation appears for that port when the associated object is highlighted in the main design window. For ports that are closest to the left or right side of an object, the text will appear horizontally; for ports that are closest to the top or bottom of the object, however, the text will be printed vertically (both orientations are shown in the picture below).
Although, by default, all port abbreviations are displayed, the Analyst can specify the allowed text orientations (horizontal, vertical or both) for each port using either Grid View or the port Details panel.
How to Specify Allowable Text Orientations for a Port (using Panels)
If necessary, select "Ports" from the Contents Type drop-box on the Grid Control panel.
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Enable "Port Details" on the Grid Control panel.
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Select the allowable text orientation(s) in the Text Orientation column in the grid. (Note: the setting can be copied from one port to other rows in the column so that a batch of ports can all be easily set to the same setting).