I am guessing you mean "move between columns" when you say "move issues in sprint".
A column is a collection of one or more status. Moving between columns changes status by moving the issue through the workflow. The workflow transitions you are using can have screens attached to them to allow the user to enter data, including comments.
Different issue types can have different workflows. You'll find the issues that ask for comments are using transition screens for the transitions you are triggering.
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