Set Image Dimensions

The Set Image Size dialog allows you specify an exact size for the screenshot.

If the “Keep aspect ratio” box is checked, changing the width value will automatically update the height value, and visa versa, to preserve the proportions of the image. When this box is unchecked, height and width can be changed independently.

Click OK or press enter to apply the new image size.
Click Cancel or press escape to return to the screenshot editor window without making any changes.

Go to the screenshot editor window...