This is an app independent answer.
For cases where an icon seems to be stuck in the Status bar, choose any of the following approach:
Force-stop the app
Find the app causing that icon.
Usually, it is easy to know just by looking at the icon and matching it with app icons under Settings -> Apps -> All apps. For some exceptional cases, you can use apps like Notification Saver or Notification History or setup adb in PC and use the command:
adb shell dumpsys notification
Single out your notification and look for the package name of the app behind that icon. Read View app's full package name? to get the label for the app from the package name.
Assumption: The app causing the issue is "AppX".
- Go to Settings -> Apps -> All apps -> AppX -> Force-stop.
That should remove the icon from the Status bar.
- Find the app causing that icon.
- Go to Settings -> Apps -> All apps -> AppX -> uncheck Show notifications -> check Show notifications.
Works well for user installed third-party apps.
There may be apps where the option Force stop or/and Show notifications would be greyed out. For such apps, only the mighty root can help. Any app having root privileges should be able kill such apps, such as OS Monitor. For example, in Terminal Emulator you can kill an app using its package name and
am force-stop PACKAGE_NAME_OF_APP