Disable third-party app without uninstall:
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Why do this:
This is so I don't lose my saved user data for that app, but prevent it from running in the background.
In this example I will use Tiktok, since I would rather not lose my profile, but it loves to phone home very often even though I uses it very occasionally.
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*Need a PC with adb installed to do this:

adb devices
adb shell


To disable:
pm disable-user com.zhiliaoapp.musically
pm disable-user nodomain.freeyourgadget.gadgetbridge
*Also press force stop in system settings on phone to fully affect it.

To re-enable:
pm enable com.zhiliaoapp.musically
*Also enabling it in google play works as well.

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Source:
https://android.stackexchange.com/questions/143560/how-to-disable-third-party-apps-without-uninstall

Date: March 1st 2023