Searched--didn't find an answer.
This may sound like a dumb question but when viewing a thread, at the bottom of the page, there's a section called "Display Modes" with the option of clicking on either "Linear", "Hybrid" or "Threaded" modes. What do these modes do, and how are they different from one another? I've never clicked on any of them.
(Might be off topic, but does this have anything to do with why it says under "Posting Rules" that "I
may not post attachments"? I don't think I did anything wrong to cause that, and it's been that way since the day I've signed up here.

)