How to Open the ProBuilder Window in Unity 6
Unity's ProBuilder is a powerful mesh-editing toolkit built directly into the Unity Editor. It lets you design, prototype, and sculpt 3D geometry without leaving your project — no external modeling software required. If you've just installed it or upgraded to Unity 6 and can't find the ProBuilder window, you're not alone. The interface has shifted slightly across versions, and knowing exactly where to look saves a lot of frustration.
What Is ProBuilder and Why Does It Have Its Own Window?
ProBuilder operates through a dedicated floating toolbar called the ProBuilder Window (sometimes labeled the ProBuilder toolbar or tool panel). This window gives you access to mesh editing actions — things like extruding faces, merging vertices, subdividing geometry, and applying materials at the face level.
Unlike standard Unity tools that live in the Inspector or Scene view controls, ProBuilder consolidates its operations into this single dockable panel. That design means the window needs to be explicitly opened each session unless you've docked it into your Editor layout and saved that layout.
Step-by-Step: Opening the ProBuilder Window in Unity 6
Step 1 — Confirm ProBuilder Is Installed
Before anything else, verify ProBuilder is actually installed in your project.
- Open the Package Manager via
Window → Package Manager - Switch the dropdown from In Project or search for "ProBuilder"
- If it shows Install, it hasn't been added yet — click Install and wait for it to complete
- If it shows Remove or a version number, it's already installed and active
ProBuilder is a Unity-developed package distributed through the Package Manager, not a third-party asset. In Unity 6, it falls under the Unity Registry tab.
Step 2 — Open the ProBuilder Window
Once ProBuilder is installed, the window is accessed through the menu bar:
Tools → ProBuilder → ProBuilder Window
In some earlier Unity versions this lived under Window → ProBuilder, but in Unity 6 the path is Tools, which is where Unity relocated many package-specific editor tools. If you don't see a ProBuilder submenu under Tools, that's a strong signal the package isn't fully installed or may need a reimport.
Step 3 — Dock or Float the Window
Once open, the ProBuilder Window behaves like any other Unity panel:
- Float it by leaving it as a standalone overlay
- Dock it by dragging it into your Editor layout — many developers dock it alongside the Scene or Inspector panel
- Save your layout via
Window → Layouts → Save Layoutso it reopens automatically next session
🛠️ Unity 6 introduced overlay panels in the Scene view. ProBuilder's toolbar may also appear as a Scene view overlay depending on your settings, separate from the main ProBuilder Window. Both can coexist.
Common Reasons the ProBuilder Window Won't Open
| Problem | Likely Cause | What to Check |
|---|---|---|
| No "ProBuilder" under Tools menu | Package not installed | Package Manager → Unity Registry |
| Menu exists but window is blank | Package installed but not initialized | Try Tools → ProBuilder → Repair → Recompile |
| Window opens but tools are greyed out | No mesh selected or wrong object type | Select a ProBuilder mesh in the Scene or Hierarchy |
| ProBuilder menu missing entirely | Compile errors blocking Editor | Check Console for errors; resolve before reopening |
The Difference Between a ProBuilder Mesh and a Standard Mesh
One thing that catches new users off guard: ProBuilder tools only work on ProBuilder meshes. If you drag a standard Unity primitive (like a default cube) into your scene, ProBuilder's editing tools will be greyed out or unavailable.
To work with ProBuilder, you either:
- Create new geometry using
Tools → ProBuilder → Create → [shape](Cube, Staircase, Arch, etc.) - Convert an existing mesh using
Tools → ProBuilder → Object → Probuilderize— this converts a standard mesh into an editable ProBuilder mesh, though with some limitations depending on mesh complexity
Understanding this distinction matters because the ProBuilder Window being open and visible doesn't mean you can immediately edit any object in your scene.
ProBuilder Window Modes: Icons vs. Text
The ProBuilder Window has two display modes: 🔲 Icon Mode (compact) and Text Mode (labeled buttons). You can toggle between them using the small settings icon in the top corner of the panel.
Icon Mode is more space-efficient and suits developers who already know the tools. Text Mode is friendlier for learning — each action is labeled, which makes it easier to map what you're clicking to what's happening in the Scene view.
In Unity 6, Icon Mode is the default, which sometimes makes the window feel empty or unclear to first-time ProBuilder users who expected labeled buttons.
Keyboard Shortcuts and the Scene View Overlay
Unity 6's Scene view overlays system gives ProBuilder a presence directly in the 3D viewport. You can enable the ProBuilder overlay from the Overlays menu (the small grid icon in the top-left of the Scene view). This is a separate entry point from the ProBuilder Window itself and surfaces a subset of the most-used tools — useful for quick edits without pulling focus to a separate panel.
Whether the floating ProBuilder Window, the docked panel, or the Scene overlay works best for your workflow depends heavily on how you've organized your Editor layout and how frequently you switch between Unity's standard tools and ProBuilder's mesh editing mode.
That balance — and which configuration keeps you productive — is shaped by your specific project type, screen setup, and how deeply ProBuilder fits into your overall modeling pipeline.