I've using Mindmanger for Windows for years and have just upgrade to MM11 for Windows and MM10 for MAC. The Windows version works fine, as always, but the MAC version (I am using this for the first time) does not seem to have a 'walk-through' view, only 'slide-show'. The feel of slide-show is very different, which is OK and I'll get used to it, but it only ever shows the top-level branches, not the sub-topics.
Are you able to use the Windows version of Mindjet on your Mac (e.g. via tools like Parallels/VMWare/VirtualBox) ?
You can also use View > Show Slides to open the Slides pane on Mindjet for Mac. Then, you position and open/close the topics as you like and right click on a topic (or subtopic) and select New Slide from Topic. This way, you can create the slideshow the way you want it on the topic levels you want.
I agree, the walk through mode is missing. Slides is not a replacement...I would suggest that your "Slide" metaphor is completely outdated and really is a "paving the cowpath" approach. Think Prezi...which is what Presentation mode on Windows MM gives you. Why are you focused on Slide metaphor...if you must go that way please don't make it the only options.
Please don't reply and tell me to use MM for Windows in Parallels. If I wanted to run Windows, I'd have a Windows machine.