The Properties Editor, found by clicking the button of the same name on the Toolbar, provides information on a number of object properties and the possibility to edit them in the dialog. First, the object must be selected in the plan.
The various object features are listed within the Properties Editor. At the bottom of the dialog is the property container with the options it provides. For example, you can select one of the features of your object in the panel above, copy it into the property container and then assign it to another object. Read more here.