Just pushed out v2.9 of the Windows app. This version now imports Mindmeister (.mind) and SimpleMind (.smmx) format files. It also supports 'Focus Lock'. The idea with Focus Lock is to select a topic then check the focus checkbox (bottom left corner of the screen.) The selected topic(s) will remain visible and all others will be 'dimmed' (regardless of which topic is selected.) If you want the focus to follow the selection then ensure that no topics are selected when you first enable Focus.
iOS/macOS support for the above is coming soon (when iOS11 is out.)
As always, any questions, suggestions or issues just let me know here.