Thanks for your question @WeerachaiVichienrat-8351. As Suwat mentioned, Kudu on Windows and Linux App Services might look slightly different & different features available.
If a feature is disabled in the portal, it's not available on Linux. Azure App Service has a rich feature-set, but not all of those features are currently available for Linux apps. We're working on adding new features all the time, and once new features are added, they'll be enabled on the menu in the Azure portal. If the menu item for a particular feature is disabled (grayed out) in the menu for your Linux apps, it's simply because we haven't added that feature yet.
If you don't see a feature you want, you can request the feature. If you want a feature that isn't currently available, please feel free to request the feature in our Web Apps Feedback forum. Please make sure to put "[Linux]" in the title so that we'll know it applies to App Service on Linux and Web App for Containers.