Can't inflate ConstraintLayout

Make sure you put implementation 'androidx.constraintlayout:constraintlayout:2.0.0-alpha3' inside dependencies in build.gradle (app):

dependencies {
    implementation 'androidx.constraintlayout:constraintlayout:2.0.0-alpha3'
}

And inside gradle.properties add:

android.enableJetifier=true
android.useAndroidX=true

It works for me in Android Studio 3.3.

EDIT: I've just noticed you don't want to use alpha version. Anyways, I hope the other parts of my answer can help.

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