@pipetboy It's already very possible by switching to mobile view emulation in the Dev tools within the browser. it's just that you have to every time you want to do that.

I found that I am able to turn it on via Lighthouse in the tools. " Apply mobile emulation during auditing" - set to "mobile"

This will enable mobile emulation as it would within web browser with the missing button.

I noticed the sidebar apps use web versions. however, There is no mobile device emulation toggle in the developer tools. It works in the browser tabs. just not the side bar. Is this intended?

@pipetboy It's already very possible by switching to mobile view emulation in the Dev tools within the browser. it's just that you have to every time you want to do that.