How do I disable the Android popup quick access bar?

I recently got a new phone, and it has a quick access bar that pops up during certain actions (I think mostly when switching apps). It has a search button, the access to apps like camera, browser, phone, messages, settings.

How do I disable it?

Edit: I have worked out I can long press then I see an option to "Always show taskbar", so I haven't worked out how to hide it but I guess it's called the "taskbar", though this is different to the normal go back, go home, app switch task bar.