iSlide > Security Export > Export Video
It will pop up [Export Video] window
You can choose from the [Preset] option to set the quality of the video by just a click.
The [Vertical resolution] of exported video is optional between 480p to 1920p. You can adjust it according to your needs.
Office 2010: 720p, 960p
Office 2013 and Office 365/2016: try 1080p
Office 365/2016: perfect for 1080p