Mobile (Portrait) View on Desktop

Hi Adobe Learning Community, How do you display a project in mobile (portrait) view when the project is viewed on a desktop computer? The slide dimensions are set to 1080px x 1920px. It’s technically a responsive project and flexboxes are used, but again, the goal is to maintain the mobile view regardless of device. (Similar to the 7taps interface if you’re familiar with that.) Thanks for your help.