You can filter files in a pull request by file extension type, such as .html or .js, lack of an extension, code ownership, or dotfiles.
Tip: To simplify your pull request diff view, you can also temporarily hide deleted files or files you have already viewed in the pull request diff from the file filter drop-down menu.
- 
Under your repository name, click Pull requests.

 - 
In the list of pull requests, click the pull request you'd like to filter.
 - 
On the pull request, click Files changed.

 - 
Use the File filter drop-down menu, and select, unselect, or click the desired filters.

 - 
Optionally, to clear the filter selection, under the Files changed tab, click Clear.
