Can't find ia_symbolComponent-pump-orientation-right class

Hello everyone,
I can't find the ia_symbolComponent-pump-orientation-right CSS class in the themes files. When I change a pump component orientation it changes normally, but when I convert the component to drawing and then try to change its orientation by modifying the class from ia_symbolComponent-pump-orientation-right to ia_symbolComponent-pump-orientation-top for example, it does not change!!

Thank you for your support

How are you "changing" the class?