Hi, there is no such option in our app (especially because on Android 5.1 and higher it wouldn't work anyway, uninstallation cannot be blocked, as it is managed by the system).
The only uninstall protection we have now is the "Device Administrator" right (you are asked to grant it when first setting up the app, you can uninstall the app only after you take Avast away from the Device Administrators' list).
You can also use the Avast Antivirus app lock for your device Settings and Google Play Store. However, this might be useless with some device types (e.g. apps on Samsung devices can now be uninstalled right from the homescreen).
