[Feature request] Solution folder
I want to suggest you to add Solution folder in your extension.

You need to do 2 things: hide some folders and files and enable file nesting.
- Hide files. Into
settings.json:
"files.exclude": { ".vscode": true, "*/**/bin": true, "*/**/obj": true, "*.sln": true, }
- File nesting. into your
settings.json:
"explorer.fileNesting.patterns": { "*": "${basename}.*.${extname}" }

all file nesting patterns: https://github.com/antfu/vscode-file-nesting-config
C# commands (C# Toolbox: Options) should be moved into Solution folder:

also it would be better if Solution folder will have Studio Icons.
how to nest all projects into *.sln and how to nest projects into *.csproj I dont know but if you can do it then calling *.sln and *.csproj files should be made by context menu (like in vscode-solution-explorer):

Hi @BachiMjavanadze This is a very good suggestion. I am still thinking If I create a specific tree structure for this feature or just add a branch extension to the current tree. I will be implementing shortly and you will be advised once I release the solution.
Thanks for the request.
The 'Add Project' functions fails anyway on the Mac, so it might be worthwhile exploring creating both the solution files (in the root solution folder) and the initial projects (in subfolders).