In fact, the only way to disable it is to install something else.
If it stays off for too long, Windows will turn it back on.
Once you install those applications, Windows Defender will disable itself.
In other words, Microsoft doesnt really carewhichantivirus program you use, but you have to usesomething.
On the one hand, this seems a little intrusive.
If youreallydont want to use any antivirus software, you could upgrade from Windows 10 Home to Professional.
Unfortunately,the upgrade costs $99.
How to Manually Disable Windows Defender in Windows 10 Home| MakeUseOf