Read the Ansys Help page in the Mechanical Application on Hydrostatic Pressure.
https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v232/en/wb_sim/ds_Hydrostatic_Pressure_Loads.html?q=hydrostatic
There you will see this note:
During a multiple step analysis, tabular data is visible for this boundary condition. This information is read-only but you can use the context menu (right-click) features of the Tabular Data display to activate or deactivate the loading per step.
That means you can deactivate the Hydrostatic Pressure load in Step 1 or any number of steps.
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