Insert > Table/Matrix > Split Spanning (Mathematica Menu Item)

Split Spanning divides a spanning entry from a formatted grid into separate entries.

Window > Stack Windows (Mathematica Menu Item)

Stack Windows arranges windows in a uniform overlapping stack on the screen (Windows and Macintosh only).

Cell > Convert To > StandardForm Display (Mathematica Menu Item)

StandardForm Display displays a selection in Mathematica StandardForm.

Cell > Convert To > StandardForm (Mathematica Menu Item)

StandardForm converts the selection to Mathematica StandardForm.

Evaluation > Start Kernel (Mathematica Menu Item)

Start Kernel starts the specified kernel.

Evaluation > Debugger Controls > Step In (Mathematica Menu Item)

Step In stops the debugger at the next stopping point.

Evaluation > Debugger Controls > Step (Mathematica Menu Item)

Step makes the debugger stop at the beginning of the next expression.

Step Out stops the debugger after finishing all evaluations in a stack.

File > New > Styled Notebook (Mathematica Menu Item)

Styled Notebook opens the Stylesheets palette to create a styled notebook.

Format > Style (Mathematica Menu Item)

Style assigns a style to selected cells or text.