How can I always show Android Studios Preview?

Found the answer. The tabs in Android Studio seem to have different amount of actions attached to them, but you can access some more if you go to Window -> Active Tool Window (with the preview tab selected/focused) and then click "Docked Mode", an option previously unavailable in the tabs options. When Docked mode is activated for the tab it is now available in the tab options!

I need preview layouts when writing code.