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The j d (calc-show-selections) command controls how
selected sub-formulas are displayed. One of the alternatives is
illustrated in the above examples; if we press j d we switch
to the other style in which the selected portion itself is obscured
by ‘#’ signs:
3 ... # ___ (a + b) . . . ## # ## + V c 1* ............... 1* --------------- . . . . 2 x + 1
If the customizable variable
calc-highlight-selections-with-faces is non-nil, then the
non-selected portion of the formula will be de-emphasized by using a
less noticeable face (calc-nonselected-face) instead of dots
and the selected sub-formula will be highlighted by using a more
noticeable face (calc-selected-face) instead of ‘#’
signs. (see Customizing Calc.)