A question about SPDIF multichannel

[yeyiyi]

My motherboard is ASUS z390h（ALC S1220A）, which has a SPDIF audio interface, but at present it only supports 2 channels. How to configure it to support 5.1 and higher channels

 

[Going Bald]

Does your receiver for the SPDIF out have settings for 2.1 or 5.1 mode?