Property View of a Component
From Documentation
Property View of a UI Tag
The property view is a tabulated view which lists applicable attribute pair values of the hierarchical view's selected node. You can open it by clicking [Window]/[Show View]/[Properties].
Using the properties grid you are able to edit the value directly. For some properties with enumeration attributes (e.g. true/false, normal/none, left/center/right), an informative combo box editor is used to help you input the correct value.