Header vs custom logo

I’m not understanding the difference between the header and the custom logo. Currently my header is uploaded to the custom logo spot. But that means I had to disable the sticky logo on the scrolling menu bar because it was way too small to see.

Am I doing it wrong? I tried putting the 985×200 full header image (with tag line) in the header image spot and then the smaller logo itself in the Header–>Custom Logo spot, but the logo superimposed on top of the full header image. So I removed the header image and just put my full header into the custom logo spot (if I put it in the Header Image spot, it doesn’t fit, even though I made it to the specifications and adjusted the Header Image Height accordingly. I left the sticky logo enabled so you can see how small it is (useless, really). But I’ll disable it again because it looks terrible.

I want the both of them. I want the full header with tag line in the header spot, but I want the small logo only to be on the scrolling menu bar when the header disappears. I thought that was what the theme allowed.

I hope I’m being clear enough.

https://teachingwhatisgood.com