Can I Make Presentations in the New MindMeister?

Yes, you can use Focus Mode to create manual presentations in the new editor. Learn how to enable Focus Mode here. 
 
However, there is currently no presentation mode available in the new MindMeister. 
 
If you're missing the old presentation mode, you can vote for it on the MindMeister feature board. For more information on how to submit a feature request, check out this article.