The shortcut keys for working with repository trees are:

• Enter when a model, version, group or schema is selected will open a diagram for that object.
• Holding Alt while selecting a table node will show that table in a currently open diagram.
• Holding Ctrl when clicking "display" to show a diagram, opens it without applying a layout. This can allow large diagrams to be displayed faster.
• F5 will refresh the tree.
• F2 when a node in the tree is selected will rename the corresponding object (note this is not applicable to repository or connection category nodes).
• Delete will delete the currently selected object (note this is not applicable to repository or connection category nodes). If the object is a schema or table in a group it will be removed from the group instead.
• Esc while the tree is restoring its expansion state will cancel the process.
• Alt+left click will display the properties dialog for the selected entity/ attribute.
• Pressing the Up/Down arrows moves the selection in the tree.
• Pressing the Left/Right arrows collapses/expands the selected node in the repository tree.

Also refer to Diagram Shortcut Keys for details.