How do I adjust font size? Disable video auto play? Reduce motion? Where are the setting for these?

Tapestry respects many of the operating system's Accessibility settings, but if you don't want to change the settings for your entire device, you can add overrides for specific settings that will only apply to Tapestry:

1. Go to Settings  > Accessibility > Per-App Settings.
    

2. Tap Add App, then choose Tapestry from the list.
    

3. Tap Tapestry to access its settings.

For more information, check out Apple's guide: Customize visual accessibility settings for specific apps on iPhone