Starguide - A Practical Guide to Astro-Photography

Select the view, press ALT+N inside the view and hold down the left mouse button, then drag the move and you will get a new preview like the one below: 

To change the preview, move the mouse pointer to one of the sides or edges of the preview until a small arrow appears, then drag the edges.

To move the preview to a different area of the view, simply click in the center of the preview and drag it to the new location.

Additional preview functions are available in the PREVIEW main menu.

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