On small screens, Phabricator should show the file tree in a more useful way. Or should avoid attempting to show the file tree.
secure.phabricator.com as of August 6 2018
- In Phabricator, set Settings > Personal Settings > Diff Preferences > Show Filetree to ‘Enable Filetree’
- View a diff from Diffusion or Differential on a mobile device like an iPhone. (In Safari, you can simulate such a device by choosing Develop > Enter Responsive Design Mode)