ESX24 Question

I'm fairly new to Logic, I have have migrated over from Studio One. I'm a little confused with something that ESX24 is doing.

When I first add a track using the sampler, i get the Library options like on the top. But after I switch off of that newly added track to a different one, I get the options like in the bottom one. I don't understand what the difference is and how I would switch back and forth. But I know that things that appear in one do not always appear in the other.

Thanks!