Continuing the discussion from Union tool, or Combine Tool:
While you’re typing, there should be a live Preview to the right of the typing field. If not, then there should be a “show preview >>” button at the bottom-right just under the typing field.
When you’re making a new topic this generally gets covered by what an algorithm thinks might be topics that already addressed what you have to say. There’s a close button to make that go away, probably on the top-right, (I don’t remember, & it didn’t show up with this way of starting a new topic.)
Oh wait, I just put in the Topic title, & the “Your topic is similar to…” field showed up. Clicking the “esc X” button, or pressing esc on your keyboard, makes it go away.
I hope that helps!