Android Studio ( Logcat Button ) disappear in Flutter

use Android Studio version 3.6.3 on my macOS Version Catalina, when I run my program use dart programming language inside my android studio, my logcat button is not shown or disappear on my android studio, by the way, I use API 30 for created my app with the dart.

this is my android studio screenshot :
(http://i.stack.imgur.com/WTVlE.png)

how can it be like that, anyone can explain.