Hi Matthew,
How are you opening the new Gann Swing chart? If you open eg a bar chart first and then change it to a Gann Swing then the defaults won’t show – you have to open it directly from New > Single Code Chart > Gann Swing Chart (or set up a keyboard shortcut). Could that be the reason?
Also, please make sure that you do not have new charts set to open with a Chart Layout as that will override any chart defaults when opening a chart.
If not, please make a quick Loom.com video showing your process (https://help.optuma.com/kb/faq.php?id=1219) and send to support.