Use Solution Explorer in Visual Studio and review the context menu options to manage the projects and files in a solution.
Solution Explorer PHP Tools for Visual Studio Documentation
How To: Create MSIX Package in Visual Studio
Introduction to projects and solutions - Visual Studio (Windows)
Customize & save layouts of your windows and tabs - Visual Studio (Windows)
Learn about Solution Explorer - Visual Studio (Windows)
10 Visual Studio Solution Explorer Productivity Tips - NDepend Blog
Important Visual Studio Windows
Multiple Solution Explorer Tools - Visual Studio Marketplace
c# - Explaining the Solution Explorer ASP.NET Visual studio 2012 - Stack Overflow