title: How completely protect/block branch in Azure Devops from Pull requests
body: <p>I found how to block/protect branch from pushes, force pushes but how to protect branch from pull requests? When somebody creates pull requests branch merges with branch which locked (f.e. master branch) without any problems or acknowledges. How to protect branch from pull request Of course if it possible?</p>
  
  <p>Branch lock (protect branch from pushes);
  Branch security (deny force pushes)</p>
  
  <p>I want to make impossible to complete pull request to locked branch. Of course if it possible.</p>