Horizon Panels is a user interface add-on that reorganizes Blender's default vertical N-panel tabs into a horizontal layout. It addresses screen space limitations by allowing users to group add-on tabs into custom categories directly from the 3D viewport. The tool automatically synchronizes category configurations across multiple installed Blender versions, eliminating the need to recreate workspace setups.

The horizontal tab interface is fully functional in Object and Edit modes. In modes that reserve mouse events, such as Sculpt or Paint mode, users can still access their tools through the standard vertical N-panel layout.