# Levels **Panel:** Grids And Levels | **Menu:** Levels button icon Tools for controlling level header visibility and level extents in the active view. All of these act on the **active view** only, and on the levels visible in it. They are the level counterparts of the [Grids](grids.md) tools and follow the same start/end convention — but note there is no level equivalent of *Extend Grids* or *Propagate Grids*. --- ## Show Headers Start icon Show Headers Start Switches **on** the header at the start end (end 0) of every level visible in the active view. It only turns headers on; it never turns one off. --- ## Show Headers End icon Show Headers End Switches **on** the header at the finish end (end 1) of every level visible in the active view. --- ## All Heads Off icon All Heads Off Hides the headers at **both ends** of every level visible in the active view. --- ## All Levels to 2D icon All Levels to 2D Sets both ends of every level visible in the active view to **2D**, so that extent and header changes made in this view no longer affect other views. --- ## Toggle Headers Start icon Toggle Headers Start ## Toggle Headers End icon Toggle Headers End Toggles the header at end 0 (Start) or end 1 (End) for **levels you pick**. Run the tool first — it starts a pick prompt ("Select levels") filtered to the Levels category. Pick the levels, finish the selection, and their headers at that end are flipped. There is no need to pre-select anything before launching. --- ## Notes - Levels are visible in section and elevation views, so that is where these tools are normally used. - Levels set to 3D share their extents across views. Run **All Levels to 2D** in a view first if you want changes there to stay local to it. - If a tool reports no levels in the view, check the view's crop, extents and category visibility — the tools only see levels the view actually shows.