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When 2D view is used, the program displays only entities that are within the "2D View Cutting Planes" tolerance of the planes that is displayed in the SAP2000 window. If you do not see all the desired objects in the a 2D view, try increasing the tolerance using the Options > Dimensions/Tolerances > 2D View Cutting Planes +/- menu command.
Please note that you can also use the up and down blue arrows shown in the figure below to change the elevation at which the 2D view is taken: