Height of the scrolling menu

Dear Contact7 developers and users,

I am using extensively Contact 7 and found it really awesome and easy to configure/maintain.

I am facing a minor aesthetic problem with the scrolling menu on the referred page. Right now the navigation through the different options is complicated by the limited height of the box (see on PC/Firefox 102).
How could the option box higher to display all available options? Something like “Select Ghkdsjdf” on https://contactform7.com/checkboxes-radio-buttons-and-menus/

Many thanks for your help,

Benjamin

The page I need help with: [log in to see the link]