Flutter not showing intelli suggestion box for colors pallet in Android Studio

I am going through one video tutorial on Flutter. When the author types "Color.blueGray" it shows her a list of blue gray color pallet in the suggestion box. But when I try to do similar it doesn't show me that box.

I tried a restart of android studio. I tried various hotkeys and settings but its not working.

This is how it should look

enter image description here

But on my system it looks like this

How do I add flutters to IntelliJ?

Now we need to launch the IntelliJ IDEA app and then go to Plugins which is present on the navigation bar on the left side of the screen then Search for Flutter and then click on install to start the process( click on accept if prompted to do so).

Does flutter work with IntelliJ?

Using the Flutter inspector, directly available in Android Studio and IntelliJ.

Does flutter work with Android studio?

Android Studio offers a complete, integrated IDE experience for Flutter. Alternatively, you can also use IntelliJ: IntelliJ IDEA Community, version 2021.2 or later.

The window you are missing is the quick documentation window. You can activate it in settings/Editor/General/Other/Show quick documenation on mouse move