> For the complete documentation index, see [llms.txt](https://help.modelreef.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.modelreef.io/syntax/understanding-the-interface.md).

# 🖥️ Understanding the Interface

- [Variable Editor Screen](https://help.modelreef.io/syntax/understanding-the-interface/variable-editor-screen.md)
- [Driver Editor Screen](https://help.modelreef.io/syntax/understanding-the-interface/driver-editor-screen.md)
- [Timing Modal](https://help.modelreef.io/syntax/understanding-the-interface/timing-modal.md)
- [Formula Modal](https://help.modelreef.io/syntax/understanding-the-interface/formula-modal.md)
- [Branch Selector](https://help.modelreef.io/syntax/understanding-the-interface/branch-selector.md)
- [Category Picker](https://help.modelreef.io/syntax/understanding-the-interface/category-picker.md)
- [Data Library Viewer](https://help.modelreef.io/syntax/understanding-the-interface/data-library-viewer.md)
- [Scenario Selector](https://help.modelreef.io/syntax/understanding-the-interface/scenario-selector.md)
- [Period Selector](https://help.modelreef.io/syntax/understanding-the-interface/period-selector.md)
- [Units & Bounds Panel](https://help.modelreef.io/syntax/understanding-the-interface/units-and-bounds-panel.md)