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The default height settings can be found in your Data Managers > Defaults menu.
In nearly all cases the Floor height and Room height should be equal (resulting in a plenum height of 0.0).
This is the correct method for calculations such as PartL and Heat Loss/Gain calculations.
Note, plenums should only be modelled if there is a specific need to do so - i.e. if they are conditioned spaces maintained at a particular temperature. If not, they should not be traced. Any ceiling plenum or air gap will be taken into account in your calculations as part of the Internal floor / Internal ceiling construction (i.e. in Data Mangers>Materials).