You can preview the content you have scheduled for your screen using the NowSignage platform, which provides a simulated representation of how the content will play back on your display.
To do this go into the screens area of your project, find the screen you wish to preview and edit the screen (either click on the name of the screen or the pencil icon):
In the area shown above, you will see a list view of your scheduled content on the right side and in the middle you have a preview mode. If you wish to preview the content, press the 'Click to preview' button and this will start playing back your content:
This may default to 16:9 landscape, so if your screen is portrait you simply need to change the ratio in the top right of the preview window to 9:16 and this will change the preview to portrait mode:
Currently the ratios above are supported for previewing, however custom ratios/resolutions are due to be supported later this year.
Please note - This preview is not a direct live view of the screen but should provide a similar experience to how the app should function and playback content on your screen.