The complete guide to Fluid UI

The most obvious change you will notice when you sign in is the new mode menu which gives you three options: Edit, Comment and Preview.

Comments

The comments mode is the single most important and exciting part of this release. All of those conversations with users, stakeholders, developers can now be done in real time in the Fluid editor.
Comments You will be able to comment and reply to comments directly in the editor. You can also do this in real time so there are no costly time delays when important decisions need to be made.