> For the complete documentation index, see [llms.txt](https://docs.heisenware.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.heisenware.com/~/changes/Q625pQNc0nXqVGPtyjAY/building-apps/app-appearance.md).

# 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/Q625pQNc0nXqVGPtyjAY/building-apps/app-appearance/pages.md) and subpages to structure apps.
* Fine-tune [in-app navigation](/~/changes/Q625pQNc0nXqVGPtyjAY/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/Q625pQNc0nXqVGPtyjAY/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/Q625pQNc0nXqVGPtyjAY/building-apps/app-appearance/screens-and-devices.md) and device.


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