Sync Project with Gradle Files button disappeared from Android Studio

Question

Importing an Android project into Android Studio, the error "Design editor is unavailable until next gradle sync" appears:

You can see that there is no option: Sync Project with Gradle Files:

Going to: File -> Settings -> Main Toolbar -> Android.MainToolBarActionGroup -> Sync Projects with Gradle Files

But the Apply option is "off" in the sense of being "locked", so there's no way to change anything:

And all options for Clean Project are not available:

Please what to do to fix this?

Answer 1

This problem was caused because I opened the project in Android Studio. But the right to do is to IMPORT the project. Thank you very much.

Answer 2

It can be found at the top of Android Studio, or at the top left side. Look for the little elephants.