I want to switch to C# from Delphi.
But the problem is Visual Studio has very different design from Delphi IDE.
In "Structure" menu, I can see controls used in my form like this:
Is there any Visual Studio equivalent of this menu?
According to your description, in the Windows Forms App project type in Visual Studio, you want to see the controls used in the form in a menu.
First you need to create a Windows Forms App.
You can then use the Solution Explorer to view the form and the controls used in the form. As shown below, I put two buttons on Form1:
If you don't find Solution Explorer, you can find it by following these steps:
View => Solution Explorer