Inspect
Allows you to look at or inspect the value of a variable or expression.
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To inspect a variable move the cursor to the variable that you wish to
inspect and choose this option. The contents of the variable will then be
available for editing.

For something like an expression, you should highlight the expression - use
the <Shift> ← or <Shift> → to highlight the variable or expression, and
choose this option.

The hot-key combination for this item is <Shift><Alt><I>.