If you find the default description displayed is too long at 130 characters. You can modify the smarty code on the template (tpl) file.
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Do your users find the tooltips that pop-up annoying when hovering your categories?
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If you find that you have to remove the "powered by prestashop" text in the footer of your page (maybe its been requested by your customer), you can do this quite easily by editing the appropriate template (tpl file).
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