When avast will also come to run inside a sandbox?
You cannot use avast for some reason or other (system file FPs)
and you have to periodically fall back onto using Windows Defender,
then Windows Defender now also runs in a sandbox.
When you wanna run Windows Defender in a sandbox,
just open an elevated command and type in:
setx /M MP_FORCE_USE_SANDBOX 1
Reboot and Defender will now run in sandbox mode,
The only av that runs inside a sandbox as far as we know:
https://cloudblogs.microsoft.com/microsoftsecure/2018/10/26/windows-defender-antivirus-can-now-run-in-a-sandbox/polonus