When a power supply has multiple stated output parameters, are those discrete output settings or some possible settings along a continuum?
Best to read a summary of USB-C Power Delivery spec.

These are discrete voltage output levels.  The amount of available current is specified for each discrete voltage setting.

Note that the default voltage / current is 5V @ whatever current is specified.  Higher voltage output is negotiated when the power supply is connected to the device being powered.

[Edit]

Here is a link to a ST PDF file that talks about USB-C and Power Delivery (PD)  ST PDF file