I just logged-in and, for this thread, went to the Display Mode pulldown combobox.
The three options that are available are:
1) Linear Mode
2) Switch to Hybrid Mode
3) Switch to Threaded Mode
Hovering over the associated icons caused a popup tag which simply repeated those descriptions.
Might I suggest two things:
Firstly, the help page should be updated to remove any reference to the Report buttons, considering they no longer appear to exist.
Secondly, that the availability of some reporting link should be put under the Thread Tools pulldown combobox, as the action is more akin to a thread utility than having anything to do with the display mode of the thread.