Query regarding the theme

I recently switched from StoreVilla theme to Online Store. I would like to thank you guys for creating a wonderful theme.

I would like to know how I can hide the main menu and search bar on the checkout page only?

Previously, when was using StoreVilla, I was using the below code to hide both items, but it does not seem to work with this theme. Kindly let me know what I am missing here.

.woocommerce-checkout .header-wrap .search-cart-wrap .advance-search {
display: none;
}
.woocommerce-checkout .main-navigation {
display: none;
}