The Recents Screen on stock Android allows for users to flip through recently launched apps so that you can switch between them very easily. But what if you could customize this Recents screen beyond switching between used apps?
This guide by XDA Senior Member kenet details the changes you need to make to add an app Quick Launcher to your recents screen. This guide is written for the ZTE Axon 7, and specifically for the A2017G and A2017U models. You need to decompile the SystemUI, change a few lines in an xml and add in the attached smali to enable the functionality. Try it out!