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Hello, First of Wellcome to PrestaShop forum.

Your image show you are using PrestaShop classic theme. If you didn't made any child theme of classic theme then you can change the template ( .tpl ) file from

/themes/classic/modules/ps_mainmenu/ps_mainmenu.tpl

and the drop down is managed by js. 

You can view this post also it will give you some idea 

Thank you