First of all, Cubase and Dorico ship with exactly the same Generic Low Latency Driver, so there is no such thing as Cubase can only 48kHz and Dorico only 44.1kHz. What sample rate is supported depends solely on the actual hardware device that is used.
Even more interestingly, you can set Cubase to any sample rate between 11kHz and 192kHz even if the hardware doesn’t support it. Of course, this may lead to funny effects, but that’s at the user’s responsibility.
Dorico is not that advanced and only offers the sample rates that the actual hardware is capable of. Dorico asks the driver what sample rates are available and the driver interrogates the actual hardware.
As Daniel already mentioned, when you go to Edit > Device Setup there is a drop down box with all the available/supported sample rates of the currently chosen driver.
Similarly in Cubase, there instead it is Project > Project Setup…