Reply To: The menu appears on two rows on both the laptop and tablet.

Hello,

1. Now your menu in one line: https://ibb.co/3dXrDSF, In your previous screenshot, You are using too many elements in the menu that is causing the issue.

02. Your issue has been resolved. Navigate to Layout > Edit Checkout top content layout with elementor and add the spacer widget above the coupon form. Check back your site and check the issue.

Best Regards.