To update files from source control:
  1. In the Project Explorer, select the file to update. If you select a folder, project, or solution, any eligible child items will also be updated from source control.
  2. choose Source Control > Update or press Ctrl+R, U.
  3. The dialog will list the files that can be updated.
  4. In that dialog, you can deselect any files you don't want to update from source control.
  5. Click Update.

Enabling the VCS > Options > Update Immediately option will bypass the dialog and immediately update the files.