Change NuGet package location folder

I want to change NuGet package folder, but it does not change it.What I do is creating file nuget.config:

<configuration><config><add key="repositoryPath" value="C:\projects\" /></config></configuration>

I added this file in the solution folder (in same folder where is .sln file) or in the project folder and after that restart VS, but nothing happen.I am using Visual Studio 2017 Community.