How did you solve this when before you said the delete button wasn’t available?
Anyway, glad your issue is solved. Please mark my answer as the solution so this topic can close.
As NateDhaliwal said, the idea is keep topics limited to 1 subject. I don’t know what “the links” are you refer to, we have many on this forum, but I can tell you that the standard behaviour of links is indeed to open in the same tab.