Move description to tooltip

Install the simple tooltips plugin.  https://wordpress.org/plugins/simple-tooltips/

Change your html in form settings for the field.

<div id="frm_field_[id]_container" class="frm_form_field form-field [required_class][error_class]">
<label for="field_[key]" class="frm_primary_label">[field_name]
<span class="frm_required">[required_label]</span>
[if description][simple_tooltip content='[description]']<img class="tooltip" src="http://yourwebsite.com/images/tooltip.png"/>[/simple_tooltip][/if description]
</label>
[input]
[if error]<div class="frm_error">[error]</div>[/if error]
</div>