How to re-enable apps using ADB?
Unfortunately there is no way on Android 6 (and even 7) to reinstall a system app uninstalled with adb shell pm uninstall PACKAGE.
The command adb shell cmd package install-existing PACKAGE can restore the uninstalled package but it has only been introduced with Android 8.0.
On these older android versions, it is safer to use :
adb shell am force-stop PACKAGE &amp;&amp; pm disable-user PACKAGE &amp;&amp; pm clear PACKAGE

so you can revert it if necessary :
adb shell pm enable PACKAGE

Note: PACKAGE everywhere above means package name of the app.