Previewing
The bar at the bottom right of your screen will allow you to save, preview and publish your toolkit.
You can use the "Save and preview" function to check on the progress of your toolkit, and to see how it will appear on a number of devices. To do this, open your preview tab and click the "Fit browser" button in the bottom right. This will allow you to select other device types to see how it will look on various screens.
If you would like to send a preview of a toolkit page to someone to review, you can do this by taking a web capture of the preview page. Click on the "Preview website" button on the bottom right of the screen to open the preview in a separate tab.
Then, find the screen capture function on your web browser. In Microsoft Edge, you can find this by clicking the three dots in the top right, clicking "Web Capture" and then "Capture Full Page". This will allow you to generate an image file of your previewed page.