In VS Code, if I open a folder hierarchy that contains multiple C# solutions, sometimes I have very spotty formatting and intellisense functionality (formatting doesn’t respect my .editorconfig file, I can’t go to definition for methods, etc.).
The other day I noticed that I had a notification visible prompting me to select a solution file – once I did this, I had a better experience.

Clicking that lets me then pick one of the .sln files it found:
However, this notification doesn’t always appear, and I haven’t been able to find out how to initiate this on demand. When I search for the keywords like "choose" or "solution" in the command palette, I’m getting nothing useful. Is there a command to initiate this?
>Solution :
Try "open" or "solution" in the command palette ([Ctrl]+[Shift]+[P]):
This will give you:

