Hello Mareks,
If you need to modify the fields in frontend, you just need to change the attribute "size" to 50 for each fields, in the file /components/com_neorecruit/screens/front.offer_form.html.php :
• line 106 for the reference,
• line 114 for the number of openings,
• line 145 for the duration.
Line 106
<input name="reference" type="text" class="inputbox" id="reference" value="<?php echo $offer->reference; ?>" size="50" maxlength="255" />
If you need to modify the longer of the fields in backend too, you will have to edit the file /administrator/components/com_neorecruit/screens/admin.offer_form.html.php and do the same modifications.
Regards,
Author