ASIO4ALL has a simple config screen. It basically just has a list of devices and lets you change the buffer size. The only way I know to access it is by using the symbol in the Windows task bar when it’s active (for example, enable it in Roon):
When I just tested it on my laptop, I noticed only the internal speaker (Realtek) was initially active. Like you, I only had stereo.
I clicked the “power” icon next to each device so the HDMI (Intel Display Audio) was active instead like this:
With those new ASIO4ALL settings, I had MCH options in Roon:
I also made sure HDMI was the default device just in case in my Windows sound settings (and checked that my sound wasn’t muted):
With those quick changes, I was able to play 5.1 DSD64 as you see here:
Hope that helps.