Importing an Object into the Active Viewport
The viewport is your means of editing a product. You can easily create viewports by:
Dragging and dropping a model onto the workspace.
Dragging and dropping a group of products onto the workspace.
Double-clicking on a product.
Ctrl + dragging and dropping a model onto a viewport.
Ctrl + dragging and dropping a group of products onto a viewport.
They can also be created using the product tabs in an existing viewport by:
Ctrl + dragging and dropping a tab onto another viewport.
Dragging and dropping a tab onto the workspace.
Tip
Shift+Ctrl + dragging and dropping maximizes the new viewport in the workspace. Ctrl + dragging and dropping cancels the maximization of the current viewport and creates a new viewport.
Similarly, tabs in a viewport are created by:
Double-clicking on a product in the Matter sidebar's product library.
Dragging and dropping a model onto the interaction zone. The Matter module will automatically create a new product.
Dragging and dropping a product selection onto the interaction zone.
To select the product to be edited (active product), simply click on a tab, and to delete it, click on the close tab 
button.
When closing the last tab associated with the product (a product may be present in several viewports), the Matter module captures a representation of the product and updates the product's thumbnail image in the sidebar.