When you create a new Design screen, it will automatically be created at the correct size to fit the device type chosen under your project settings.
To change the dimensions of your screen:
- Open your project
- Hover over the screen you want to edit > Edit Design
- In the Design screen, click on the screen name in the top left-hand corner of the canvas screen
- Manually enter the width and height. Alternatively, you can click and drag the corners of the canvas screen to resize it
- Hit close when finished
Note - it's not currently possible to resize screens imported into Marvel but you can add the image to a new Design screen and resize it there.
You can also edit the screen size by dragging the edges of the Design screen to create any size you want.