Which feature allows for the swift adaptation of layouts across different pages in Liferay?

The swift adaptation of layouts across different pages in Liferay is facilitated by the use of Page Templates. Page Templates enable developers and content creators to define a consistent structure for pages, which can be reused across different sections of a website. This feature streamlines the design process by allowing users to create a predefined layout, including specific portlets and arrangements, that can be applied to multiple pages.

By utilizing Page Templates, changes made to the template can automatically propagate to all pages that utilize that template, ensuring uniformity and saving time in maintaining layout consistency across the site. This adaptability is particularly beneficial when updating the look and feel of a website, as it minimizes the manual effort required to adjust individual pages.

The other features listed do play important roles in Liferay, but they do not specifically enhance the adaptability of layouts across multiple pages in the same systematic way that Page Templates do. For instance, the Theme Editor focuses on customizing the visual appearance of the site through themes, while Layout Display Templates provide flexibility for displaying content within a specific layout, and Site Settings deal more with overall site configurations rather than page-specific layouts. Thus, Page Templates stand out as the most effective feature for the rapid adaptation of layouts across different pages.