Question How to enable 5.1 ch and Dolby digital in PC with Soundbar

[rtxWARDADDY]

I have bought Soundbar with 5.1ch & Dolby Digital I have connected it to my desktop using Optical cable, is there anything more need to to get most out of it?
here is few queries I have:

1. iam not getting the 5.1 option in spatial sound(output is selected to the sound bar) it just shows headphones there.(images attached)
2. how to know that 5.1ch & Dolby digital working correctly?

Here is my PC specification:
Intel® Core™ i5-12400F Processor
ASUS TUF GAMING B660M-PLUS D4
Adata XPG Spectrix D50 RGB 16GB (8GBx2) DDR4 3200MHz
ZOTAC GAMING GeForce RTX 3070 Ti Trinity OCCrucial
MX500 500GB 6.35 cm (2.5-inch) SSD
Antec HCG-1000-EXTREME SMPS
Antec DF600 Flux
DEEPCOOL GAMMAXX 400 V2 Blue LED air CPU Cooler
OS: Windows 10

Soundbar: MOTOROLA AmphisoundX Vibe Dolby Digital 500 W Bluetooth Soundbar (Black, 5.1 Channel)
Optical Cable: https://zebronics.com/products/zeb-oc150