Hello,
01. It’s likely that your site is using a custom header. The WoodMart theme allows assigning different headers for different pages. You can learn more about this here:
https://xtemos.com/docs-topic/how-to-set-different-header-for-specific-page/
To resolve the issue:
Check the custom header assigned to your specific page and either edit it or switch to the default header. Guide:
https://xtemos.com/docs-topic/options-for-pages/
To modify your menu items (such as categories), go to > Appearance > Menus and edit the relevant menu product categories. to add or remove items as needed.
To customize the mobile menu layout > navigate to WoodMart > Header Builder > Edit the header marked with a star icon (this indicates the default header)
https://prnt.sc/Ct9ehRDvvDV9
Switch to the Mobile tab, hover over the Mobile Menu element, and click the pencil icon > From there, you can toggle the “Show Categories Menu” option or choose a different menu entirely.
https://prnt.sc/z532Aa-glTHl
02. Regarding your second question about adding multiple currencies, you’ll need to use a plugin for this functionality. https://wordpress.org/plugins/woocommerce-currency-switcher/
Best Regards,