How do you want to save and export your project?
Saves all scenes into a single HTML file. Easier to share, but the file contains all data.
Saves the current scene to its own HTML file. This is a legacy method.
Enable separate layout settings for mobile devices. This will add a 'Mobile' profile to all scenes.
Quickly preview the "All In One" export on a simulated mobile device. If Dual View is on, this shows the 'Mobile' layout.