On the web
Tap on the screen share and use the resize handle to drag it to the desired size.
On the wall
Screen shares can be resized on the wall by any of the following methods:
- Use the same gesture you would use to zoom in and out on an image using a touch screen
- Click the increase or decrease icons to change the image's size
- Click the number between the increase and decrease icons and type in a scale for the image (minimum 100, maximum 400)
Find on canvas
Locate your screen share on the canvas by opening the screen share drawer and clicking Find on canvas. The canvas will automatically pan until the screen share comes into view.
Source: Nureva Span