Simple Visual Studio 2015, 2017, 2019 extension that automatically collapses the using statement regions when a C# code file is opened. When tools make changes to the usings region, it will stay collapsed. Having your caret in the region will prevent it from automatically collapsing.
You can install SeeUsingsLater through the extensions menu in Visual Studio by searching for SeeUsingsLater. You can also find it online in the Gallery.