Hello,

First of all thanks for choosing our Theme, we are glad to be you in the WoodMart WordPress family :-).

Please ask your hosting providers to set the php_max_input_vars to 5000 or above. Then Clear cache and check back.

You can read our detailed documentation in following link:
https://xtemos.com/docs/woodmart/faq-guides/menu-doesnt-save-custom-fields/

If the problem continues then provide admin panel login details of the website to check it myself and help you out accordingly.

Best Regards.