Is there a way to check an expression without a graph displayed. It can be distracting if all you want is to check if a factored form is equivalent to a given expression, etc.
You can use hidden: true to use a graph for calculations, but not actually display it. There are other ways to use CL to check expressions using simpleFunction and evaluateAt as well as using countNumberUsage to check for a specific form. countNumberUsage is not in documentation, but there are plenty of threads related to your question.
countNumberUsage right here! 
https://teacher.desmos.com/computation-layer/documentation#functions:countNumberUsage
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Didn’t know it was updated. Thanks!