This is the 'Automatic Overview On/Off button' insertion and code for its function - 'ONRELEASE={invert(%lua.OverViewModeOn)}'.
Spoiler: note
1/
'ONLONGCLICK=sc_RouteSettings' - is a shortcut to the routesettings window, on long press of button
2/
~~~~~~~~~~~~~ is the '<TEXT CLASS="postcode" >' and the seven other entries that are atached to this button but are not part of its function. (Will be explained in a later post)
'visible%lua.muteb)'- This button is only visible if it has been selected 'ON', see morco_button.ui - <row text="Mute Button" type="ChkOnOff" isselected="lua.muteb" >
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