dependencies {

implementation 'com.android.support.constraint:constraint-layout:2.0.0-alpha2'

}

dependencies {

implementation 'androidx.constraintlayout:constraintlayout:2.0.0-alpha2'

}

app:layout_optimizationLevel=”standard|groups”

Documentation is available on https://developer.android.com/reference/android/support/constraint/ConstraintLayout.html