u/wwmoggy

Over and over I see posts saying Double-clicking home will let you force-close background apps. This does not force them; it only removes them from the last-used list.

you can either go to Settings - Apps - App name - and click "force close."

or install an App killer like the TDUK App killer in the play store or sideload the Background Apps & Process List and use it to kill them.

I use the Tduk app killer; it kills all background apps with one click. and it has a whitelist. I add Projectivy to the whitelist, as that is my default launcher