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Problem:
If you're experiencing issues with the width of the dropdown menu in WPML not being able to be shortened after adding CSS to WPML's additional CSS section, it might be due to the CSS settings of the JetMenu submenu.
Solution:
First, check the CSS controlling the submenu's width. The relevant CSS is:

.jet-mega-menu.jet-mega-menu--layout-horizontal .jet-mega-menu-sub-menu {<br />    position: absolute;<br />    top: 100%;<br />    min-width: 200px;<br />    z-index: 998;<br />}

You can adjust the

min-width

property to a value that suits your needs. If you want to specifically target only the WPML menu item, use its unique ID, which in this case is

jet-mega-menu-item-wpml-ls-52-en

.
Additionally, we recommend inserting the CSS in the WordPress Customizer under Appearance > Customizer > Additional CSS to ensure it takes effect.

If these steps do not resolve your issue, or if the solution becomes outdated, please check the related known issues and verify you have the latest versions of themes and plugins installed. If the problem persists, we highly recommend opening a new support ticket on the WPML support forum.