A bar is disappeared in IntelliJ - intellij-idea

After I upgrade intelliJ community version to the latest, one of bar ( don't know what it's called ) has been disappeared.
In old version, there is a long blue bar right above the menu bar which contains File, Edit, View, etc like below.
But in new version, the long blue bar right above the menu bar is disappeared. I checked setting but couldn't find how to get it back.
Does anyone know how to show the blue bar?

It's a new feature called "Borderless UI", to turn it off try this advice: https://youtrack.jetbrains.com/issue/IDEA-219212#focus=streamItem-27-3615325.0-0

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