I had the same problem. Even when the solution is open, I still could not see Change Source Control
.
This seems a little strange, because I chose the solution in the solution explorer. If I selected any other item in the solution explorer (for example, any file), I could go to File -> Source Control -> Advanced -> Change Source Control...
and remove everything from there.
Perhaps it was that I had an element selected that, as far as Visual Studio was concerned, had no bindings to the original control, so it did not show the possibility of changing them.
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