How do you change bitdepth from 24bit-32bit? Issues - Windows

I have activated my interface, and cannot find alot of information, regarding changing the bit depth resolution on my windows device. I currently have it set to 24 and the drop down menu that usually lets me select the interface is grayed out. I would like some help if possible as I am lost.

using UR44-C on windows 10 64 bit, any information that you can give me would be very helpful.

I guess you use the windows Audio function. You would have to install an ASIO driver, maybe ASIO4ALL.
In Cubase f.e. you can change the preferences to 32 bits.