New to Dorico, beginner's luck

How do I keep the new added measures from throwing up a whole note rest in front of what I am entering? Or, if they automatically put in a whole note rest, can I edit all the new ones out so that I have blank measures?
I presume I should enter the new measures where I left off, (I only have about 8 measures on the score so far).
As well I noted a topic on the forum regarding the beams on the 16ths and 8ths, tied together. I will try the solution suggested there before I go further either.
I will double check what’s entered on the tympani stave. I had thought it loaded correctly. Also I noticed that the Halion console only shows 16 voices. Is the work I am doing limited to just those 16 staves? the parts are NOT doubled, so I can’t enter them as sections.