I believe this is a pretty straight forward question. In Visual Studio 2015, Ctr+M+O collapsed all sections. I learned this trick from here: Visual Studio - Command to collapse all sections of code? Unfortunately, his does not work in Visual Studio 2017.
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Possible duplicate of [Collapse all methods in Visual studio code](https://stackoverflow.com/questions/42660670/collapse-all-methods-in-visual-studio-code) – jonvw Oct 09 '18 at 17:46
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@jonvw Completely different question. This is about ALL. People see the other Q (I know I did) "collapse all methods" and focus in the "collapse all" part. The "methods" is confusing -- who would want that, and wouldn't it be called "collapse ONLY methods"? But that oddly-phrased Q comes up first in searches. – Owen Reynolds Aug 08 '20 at 14:38
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Use Ctrl + M + A to collapse all, but first you need to enable it through Tools > Options > Text Editor > C# > Advanced > Outlining > Tick Collapse #regions when collapsing to definitions.

Anja
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It is Ctrl+M+O to Collapse all https://stackoverflow.com/questions/42660670/collapse-all-methods-in-visual-studio-code?rq=1 – Akshay Anand Jun 20 '19 at 18:56
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1@AkshayAnand Ctrl+M+A will collapse up to the namespace, so my answer is technically right. – Anja Jul 15 '19 at 10:32