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Where How to modify theor create custom contact form 7 select options

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Where to modify the contact 7 select options

I'm using contact form 7 and here is the actual contact form 7 code to display the select drop down

<div class="select-wpr">[select* program id:program first_as_label required "Choose your program of interest"]</div></div>
<div class="full-width">
<div class="select-wpr">[select* campus id:campus first_as_label "Choose campus"]</div>
</div>

Where can I go and modify the actual select drop down options? I want to add <optgroup> to the select options but can't find where to go and modify that. Where is that located in wordpress?