Hello,
I am confused a bit. As I understand you are trying to set the size for WP sub-menu items.
By default, WordPress does not provide the option to set any height and width. The size option provided in the menu item are applied to mega menu blocks, but they are not applied to the default menu items.
Add the class to the menu item and change it with custom CSS. If you need help with CSS, add the class and will provide CSS code.
If you cannot save any settings in the last three menu items at all, then check your site specification, please read more here: https://xtemos.com/docs/woodmart/faq-guides/menu-doesnt-save-custom-fields/
Best Regards