App switcher is a component of the native launcher, so not really going to be able to change it anymore (since about Android 11 or 12) - God knows I’ve tried, because I used a different app switcher for years.
If you just need to close all apps (not sure why, Android is much better about memory management now, and I say this as someone who abuses a phone), just create a shortcut with Tasker/Macrodroid/3C Toolbox, etc
Macrodroid has a drawer it can open from a side swioe, and Jina App Drawer has something similar. I use both, and have some shortcuts there for things.








If people can function only with a phone, there’s a LOT they aren’t doing.
I use my phone constantly, but trying to get even a rooted Android phone to replace my PC’s? Yea, no.
I’m not doing spreadsheet stuff only on my phone, or documents, or page layout, etc.
That younger folks are heavily mobile centric is a result of pressure by Google/MS, etc to get them used to it. When they’re used to the limitations of mobile it’ll be easier to limit PCs in the same ways.
And business, yea, no, mobile isn’t replacing computers. They’re great adjuncts, but even my laptop screen is sometimes too small - and I’m not someone that needs a large screen although time.