What happens to existing screens when the themes web block properties are changed?

When the properties of a themes web block are changed, only the newly created screens that utilize that particular web block will reflect those changes automatically. Existing screens that are already built and utilize the original properties of the web block will not update themselves to reflect the new properties. This allows developers to maintain a consistent look and feel for the existing screens even after making changes to the theme, ensuring that any customizations or designs are preserved until they are intentionally updated.

The reasoning behind this behavior is related to how web blocks are designed to function within OutSystems. Each screen is essentially a snapshot of the configuration of web blocks at the time of its creation, meaning modifications made after that point do not retroactively affect previously designed screens. New screens, however, will inherit the latest configurations when created, thereby reflecting any updates made to the themes web block properties.

This behavior promotes control and flexibility in application design and development, allowing for gradual updates rather than abrupt changes that could disrupt user experiences on already deployed screens.