For the master and the slaves you can choose a fixed independend playback monitor (head) and a automatic or fixed aspect ratio:

The target playback head number for full screen playback is defined with the Head edit field entry in the option panel.

To choose a fixed play back aspect ratio which is independend for the video file setting, use the Display | Aspect Ratio menu. Sometimes the video playback filter can't detect a 16:9 in a 4:3 container. You can also force syncMaker to playback this special case by choosing the 16:9 in 4:3 aspect ratio menu entry. If you like to span the video over the full available monitor size, choose Screen.

If you like to display the fullscreen over all available monitors (heads) check menu entry Display | Fullscreen on all Heads. In this case the palyback head setting is ignored and the video is spanned all over the available monitors.

The settings are stored on closing syncMaker.