A simple shape browser allows browsing all shapes on a layer. To do so, select the layer or layers to browse in the layer list and choose "Browse shapes" from the "Tools" menu.
A browser dialog will appear that lists the cells, shapes and cell instances. Selecting a cell will display all shapes in the cell in the middle list and the cell's instances with respect to the top cell in the right list.
If a shape is selected, the layout canvas highlights this shape by drawing a marker box around the shape and zooming to the shape. How the shape is shown can be configured on the "Configure" tab of the shape browser dialog or on the respective page in the "Setup" dialog.
Another feature that among many other things allows inspection of shapes is the "Search and replace" function (see Search and Replace).