The Suppress("OPT_IN_IS_NOT_ENABLED") doesn't work

Question

After suppressing the OptIn warning, I was expecting it would go away, but it's still popping up after compile, any way to get rid of it?

@Suppress("OPT_IN_IS_NOT_ENABLED")
@OptIn(ExperimentalMaterialApi::class)

Answer 1

According to this question: How to set Opt in what resolves the problem is adding the following snippet to build.gradle (app)

kotlin.sourceSets.all {
    languageSettings.optIn("kotlin.RequiresOptIn")
}