How to see camera preview ( picture in picture) even when not selected?

Basicly I want to lock the preview and see it always. 1 hour of searching and still didn’t found out how…

Here you can see what I am talking about : Creating a quick Unreal Engine 4 scene - YouTube

I think you’re just looking to push the (very tiny) pin button…top left I think…just hover over every corner of the camera preview until you find the pin button…click it and it’ll stay…

Thank you!