# Selection Modes ## Default Selection The default selection mode allows you to select products in your model. Left-click a product to select it; left-click another product to add it to your selection. Selected products will be indicated with a green outline; the rest of the model will appear slightly transparent and greyed out. Left-click an already selected product to remove it from your selection. Press *Escape* or click the *Clear selection* button on the left-hand side of the screen to clear your selection. To select a product that is behind another product from the current camera angle, repeatedly hit the *Tab* key to cycle through products behind your cursor. Hit Ctrl A to select everything in the current scope. Use a selection window to select an entire portion of the model view at once: click, hold and drag the left mouse button to create a selection window. A blue selection window (drag from left to right) will select all products that fall completely within the bounded area. A green selection window (drag from right to left) will select all products that fall within the bounded area or cross the edges of the bounded area. When working with [assemblies](https://help.qonic.com/documentation/qonic-application/modeling/modifying/assembly-editing), there are several ways to select a desired level in the assembly from the model view. To select subassemblies in the model view, double-click to dig one level deeper, triple-click to dig another level deeper and so on. Alternatively, click and hold the left mouse button until you reach the level of the assembly you want to select. Finally, if you are only interested in the lowest level of the assembly, hold Ctrl and left-click. ## Deep Select The Deep Select mode allows you to select faces, edges, verices, bodies, chalk curves and closed boundaries for direct manipulation of the geometry. To enable Deep Select, click the *Deep Select* icon in the bottom toolbar or hit D. A black preview of the face, edge or vertex you are about to select will be displayed when hovering the cursor over an entity. A selected face, edge or vertex will be highlighted in green. To select an entire body, either individually select all its faces and edges **or** hold Ctrl and left-click the body. To select a closed boundary on an existing face or on the XY-plane, move your cursor inside that boundary and hit the *Tab* key. The boundary should now be highlighted; left-click to select it. A boundary can be defined by 3D geometry intersecting with the highlighted face, and/or chalk curves drawn on top of this face. To select a face or edge that is behind another part from the current camera angle, hit the *Tab* key to cycle through faces and edges behind your cursor. Use a selection window to select multiple bodies, faces, edges or chalk curves at once: click, hold and drag the left mouse button to create a selection window. A blue selection window (drag from left to right) will select all entities that fall completely within the bounded area. A green selection window (drag from right to left) will select all entities that fall within the bounded area or cross the edges of the bounded area. use the Tab key to cycle between bodies, faces, edges or chalk curves.