You can represent some math elements in more than one way. For example, delimiters can appear as 
, 
, or 
. Division can appear as 
, 
, or 
.
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Select the entire element.
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On the Operators, Large, Delimiters, or Calculus page of the Equations panel, click Toggle Format. The command is the same on all four pages and operates on any element with multiple formats. Click more than once to get the format you want in some cases.