How to tie or untie a note under special circumstances?

Sorry first due to my lack of knowledge in music notation, I don’t know how to describe this situation.

I want to type something like this(see the upper one):
But it ended up like this(see the lower one):

I wonder how to make lower one like upper one. BTW I just want to make a change only in this bar instead of whole workflow.


Well, since enough mentioned you were to new to music notation, I feel the liberty to tell you the way you’re wanting to notate it is incorrect, and Dorico is trying to help. Don’t take that as anything other than me being helpful.

But if you want to, you’ll need to use Force Duration, by pressing O.