How to fullscreen preview window???

i’m talking about this:

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How to make it fullscreen?

Pilot the camera and make the actual editor viewport full-screen? I mean, you’re full-screen, it’s not like it’s important which viewport it is.

It is important actually, thats why I’m asking. I have a character Blueprint that is a top down view and I need to set that BP on the scene, on second monitor so I get the view of the actual camera that I would normaly see in game.
And on the first monitor I would create the level. Thats why it’s important for this preview window to be fullscreen, so I can see what I’m doing

You can actually have multiple viewports open. Lock one viewport to whatever object you need and use the other to move it.

Although not full-screen, it can at least double the preview window.