How to make extenstion enable by default for a share extension app in Activities?

Hi Dev.,
I am developing a shared extension app and by default device's activities screen display switch off for my extension app . I want to enable the switch for my extension app when app is installed into iPhone device. I saw, the some extension app (KeepLock iOS app ) had implemented same feature...
I have added below keys in my extension app:

<key>NSExtension</key>

<dict>

<key>NSExtensionAttributes</key>

<dict>

<key>NSExtensionActivationRule</key>

<dict>

<key>NSExtensionActivationSupportsFileWithMaxCount</key>

<integer>1</integer>

<key>NSExtensionActivationSupportsText</key>

<true/>

</dict>

</dict>

<key>NSExtensionMainStoryboard</key>

<string>MainInterface</string>

<key>NSExtensionPointIdentifier</key>

<string>com.apple.share-services</string>

</dict>

Is there any key missing to add into plist to enable by default for extension app?

Please help me!

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Thanks.