Hierarchical display
Objects of the loaded model are shown in the TOM Explorer Tree. By default, all object types (visible tables, roles, relationships, etc.) are shown. If you only want to see tables, measures, columns and hierarchies, go to the "View" menu and toggle off "Show all object types".
Expanding a table in the "Tables" group, you will find the measures, columns and hierarchies contained in the table presented in their respective display folders by default. This way, objects are arranged similar to how end-users would see them in client tools:
Use the buttons immediately above the Explorer Tree, to toggle invisible objects, display folders, measures, columns and hierarchies, or to filter objects by name. You can rename an object by selecting it in then hitting F2. This also works for display folders. If you double-click a measure or calculated column, you may edit its DAX expression. Right-clicking will show a context menu, providing a range of handy shortcuts for operations such as setting visibility, perspective inclusion, adding columns to a hierarchy, etc.