You can easily switch between DYM Games and other presentation softwares (ProPresenter, Powerpoint, Keynote, etc.).
Each app sits in a layer on your presentation screen. All you have to do is turn off the layer(s) above the layer you want to see.
ProPresenter uses the "Output" button to turn itself on/off. DYM Games uses a "Live/Off" switch in the upper right. Powerpoint uses the "exit presentation" button.
If none of this makes sense, watch this video and it should become crystal clear!