- Open the VM for which you want to add new custom resolution.
- Open Configuration Editor by clicking "Edit" or using menu "File->Configuration Editor" or just by pressing Ctrl+E.
- In the left pane of the Editor's window, click "Video".
- To add new resolution, click "+" button.
- Specify the width and heights in pixels in the "Add Screen Resolution" dialog and click Ok.
- Close Configuration Editor by pressing Ok.