That's because 99% of FxSound users don't know what they are talking about when they talked about they "can't" find their EQ. Then they blame it on the new realtek audio console app ruining their life. Then they followed a thousand wrong advices on how to get the old realtek hd audio manager installed on their windows 11 computer. Then they finally gave up and they installed FxSound.
People kept on complaining about "stuff" missing entirely misunderstood the whole point. This "non-problem" has been around since Windows 7 as Fireberd figured it out over 10 years ago why his ancient Gigabyte branded Realtek HD Audio Manager didn't have the 10 band EQ. It was because his Gigabyte motherboard's Realtek audio chipset came with Creative Soundblaster app (and that app had the 10 band EQ).
They can only give you 1 EQ.
All audio configurations are done via the audio configuration app (such as realtek audio console, dell audio app, waves maxxaudio pro app, hp audio app, b&o audio app).