In the iOS 26 developer preview, I noticed that the new Liquid Glass style only applies when the user’s home screen theme is set to transparent. Is it possible to allow users to directly set the new Liquid Glass style for widgets, instead of having it tied to the home screen theme setting?
The system modifies the appearance of your widgets accessory family widgets based on various context and user settings. So what you could do is customize your widget’s design based on the rendering mode by reading the rendering mode from the environment values using the .widgetRenderingMode key.
I'd suggest you checkout Optimizing your widget for accented rendering mode and Liquid Glass to learn how to update your widget to support Liquid Glass.