How to adjust header menu size

I tried to adjust the size of the header menu by editing container size , but it did not work. You can check the picture attached, there are not enough products to fill the whole white space. Thanks for your help.

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Hello,

Navigate to Appearance > Menus > Edit Menu > Expand the menu item, and in the dropdown settings, set the drop-down settings.
https://postimg.cc/PvbwVWY1

Best Regards

[Author]

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