Free text customized field too short

Free text customized field too short

Hi,
I'm trying to create an additional free text 'Description' box as a customized field in 'Tasks' in ZOHO CRM.  Whenever I create one however (in both Two Column and One Column format), despite asking for the maximum 255 character limit, the text field is very short.
 
Is there anything I can do to overcome this?
 
Thanks
Angela