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I think people will come to the situation where they don't bother what apps are currently open and just want to close them all and see the app drawer full-screen.
Where to add a button to close all is up to the design team. My idea would be to the right of the last/rightmost app, visible as soon as there are 2+ open apps.
I opened in os-issues because I don't know what additions would be needed for phosh to know what to close.
To enable design management, you'll need to meet the requirements. If you need help, reach out to our support team for assistance.