Hi 
I have a field that its string is too long and odoo wrap it automatically and show it in 2 lines. How can I change my xml code to show the name of my field in one line?

example of my code:

***** I tried these below ways but didn't find my answer!!!!!!!!!
1-  style="width:400px;" 
2-  style="white-space: nowrap;" 

3-  class="nowrap_label"

4- class="oe_inline"

my code template: 

group string="Discount info" >

    field name="payment_terms_disc_percentage" readonly="1" />

    ...

    ....

/group>