For the PC Monitor issue: To prevent this sort of behavior. Open Group Policy Editor Computer Configuration>Administrative Templates>System>Device Installation Prevent automatic downloads of applications associated with device metadata = Set to Enable.

To get rid of it once installed you have to remove it from the Windows Store since it's an app, not an installed program. For me, this was not possible as there was no way presented to uninstall it in the app store. I had to do it from terminal with this command, which could vary a bit depending on the exact app version:

Remove-AppxPackage LGElectronics.LGMonitorApp_1.2606.1601.0_x86__cfnzzhwkr8z5w