Type sizes in Sixcycle for mobile are fixed, and do not respond to changes to default font size at the operating system level. There was a time when the app did respond to changes to the default font size, but it produced too many problematic layout conditions (see below for an example). 

We are aware of, and sensitive to, the need for changes to font sizes in the app to support accessibility requirements. Future work will re-introduce the connection to default font sizes in specific areas.

Don't hesitate to reach out using the support chat below for any reason.
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