Cell > Grouping > Open All Subgroups (Mathematica Menu Item)

Open All Subgroups opens all groups in a selection.

[Right-click] > Open in New Window (Mathematica Menu Item)

Open in New Window opens the selected (or clicked upon) documentation link in a new help viewer window.

Cell > Convert To > OutputForm (Mathematica Menu Item)

OutputForm converts the selection to Mathematica OutputForm.

File > Printing Settings > Page Setup... (Mathematica Menu Item)

Page Setup controls the size and shape of the pages to be printed.

Cell > Convert To > Raw InputForm (Mathematica Menu Item)

Raw InputForm converts the selection to Mathematica raw InputForm.

Help > Register this Mathematica... (Mathematica Menu Item)

Online Registration opens the Mathematica registration website.

Edit > Select All (Mathematica Menu Item)

Select All selects all cells in the current notebook.

Cell > Cell Tags > Show Cell Tags (Mathematica Menu Item)

Show Cell Tags toggles the display of cell tags in a notebook.

Show Debugger Tools Window toggles the display of the Debugger Tools window on or off.

Show Stack Window toggles the display of the evaluation stack window on or off.