You can use the little white circle to move your topics to any place you want. If you do this with Topic 1 in your example. The other topics will follow. You may need to align them again with Format => align topic left
This does not work for your subtopics since there is no whitecircle available.
For me this is a lot of work for just a layout thing and I always want my mindmaps to work for me and not work on my mindmaps, so I never bother much about layout. But that's just me ofcourse ;-)