To give Site Owners a preview of what their sites will look like post-change, and a chance to feed back to the Mosaic team, we are initially releasing this change on our demo environment only. This review period will last for a month, until 2 August 2019, and we'd welcome your views (positive or otherwise!).
To view the 'spacious' version of your site, add 'demo-' to the beginning of your site's Mosaic web address (this is the one with '.web' in the URL), e.g.:
Please note that the demo environment is frequently refreshed. If you notice display issues on the 'demo-' version of your website, they may be due the environment being refreshed. In this case, please try waiting at least an hour before revisiting the site.