Go to Render>Render Dimensions

Then pick Render to exact resolution

Click the Match Document Window button, then input the dimensions you want in the boxes.

When you render if the dimensions you picked are larger than the view window, you won't see a complete picture in the render window, just use the mouse & you can move it around to see it all. When you save (File>Export>Image) however, the picture will be the full one.

The best & most beautiful things in the world cannot be seen nor touched... but felt in the heart.

Helen Keller

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