Connected display layout
When you connect your device to a Chromecast or HDMI output, you can change various aspects of the secondary display. To do this, first make sure that you have connected your secondary display, then open the right hand 'Display' options menu and click on 'Connected display' to access the settings. If you have not connected a secondary display, you will not be able to access the Connected Display settings window.
Depending on which mode you are using the app in, you will see differing degrees of customisation - Performance and Stage Mode show minimal customisation, whereas Presentation Mode allows complete customisation of the secondary display.
Various settings you can change are the display margins, whether to show chords or not, the maximum autoscale size, the positioning of information text and the size of this text, any background image or video to use, a logo of your choice and the transition time between slides. Most are self explanatory.