For those of you who are frustrated that your layouts are not available in the Web App or that the layout you used last is not saved/remembered when you open the Web App again, here's a trick you can use on both your pc or your phone/tablet.
On your pc. Open the latest version of Edge. Launch the Web App. Click on the 3 dots in the upper right corner of the frame (...). Click on Apps, then Install this site as an App. 
Follow the prompts and create a desktop app or pin to the taskbar. Now, set up the resources and layout as you please. This layout will be saved the and appear the next time you open the App.
On your phone/tablet. Open the Edge App and Launch the Web App. Click the 3 bars icon at the bottom right of the screen. Select "Add to phone". Follow the prompts and save and you will have a new app on your device. Now create your layout and it will be saved automatically. The next time you open the app your last layout will appear.