From the “headphones” menu (top-center) pick the model you are using.
From the “person” menu (top-right) pick the best listener model for you. Use the “Check around” mode, move the room, pick the model that sounds more natural to you.
Set the matrix to “MIX”. Select the third row, pick the “Ideal” monitor model.
Use other matrix slots for checks. Use the “Loudness” knob for checks at other apparent levels (always revert it to the center).
Remember to bypass MixingRoom before rendering the mix to disk.