# App appearance The UI editor offers a set of tools, empowering you to tailor the appearance and behavior of your app's user interface. These features are designed to facilitate the creation of consistent, responsive designs that seamlessly adapt to various screen sizes and devices. * Create [pages](/~/changes/eYCCpn9cCBKOYnZA6a8f/building-apps/app-appearance/pages.md) and subpages to structure apps. * Fine-tune [in-app navigation](/~/changes/eYCCpn9cCBKOYnZA6a8f/building-apps/app-appearance/in-app-navigation.md) to guide users effortlessly through complex app structures. * Define the overall look and feel of your interface using [theming](/~/changes/eYCCpn9cCBKOYnZA6a8f/building-apps/app-appearance/theming.md). * Preview and customize your interface for smartphones, tablets, laptops, and desktops. Precisely size and position widgets and UI elements for each [screen size](/~/changes/eYCCpn9cCBKOYnZA6a8f/building-apps/app-appearance/screens-and-devices.md) and device. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.heisenware.com/~/changes/eYCCpn9cCBKOYnZA6a8f/building-apps/app-appearance.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.