Hi @jmarie,
When confused about features, its always a good idea to refer to our $1 one dollar wordpress themes. If a feature exists there, then you are either A) missing something or B) there is an issue with your installation specifically. Here are examples of the front end submission form with category options:
– http://bycater.ca/add-your-business/
– http://whatlocalscallit.com/add-a-place/
Its currently impossible to turn off the category selection option from the submission form. So unfortunately, you seem to have a unique issue. The only options we can recommend are
– Purchase 1hr of product support so we can investigate your unique scenario
– Switch to one of the base wordpress themes and see if the issue persists
– Re-install the plugin
Regards
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BePro Software Team