You would use pressure on full plate when the pressure loading is constant over the area of application. This is generally used for applying vertical pressure loading on floors/roofs etc. Hydrostatic load on the other hand would represent a triangular variation of pressure ( example lateral water pressure or lateral earth pressure on walls ) or a trapezoidal variation of pressure ( lateral pressure due to earth or water with a surcharge value at top for example ) . Go to General > Load & Definition > Load Case Details > Select a load case and click on Add to get a list of load items, within which these options would show up under Plate Loads
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