If you are using also YITH WooCommerce Catalog Mode and it is activated, the General settings section in Other Settings tab will be hidden, because the Hide price and Add to Cart options are managed by Catalog Mode plugin.
If you want to display “Add to Quote” button and at the same time hide price and cart button for some specific products only, you can use YITH WooCommerce Request a Quote in combination with YITH WooCommerce Catalog Mode.
To do that, you have to enable the “Request a Quote” button for the specific products you are interested in.
Then, from Catalog Mode option panel you have to add these products to the Exclusion list, enable reverse functioning for Exclusion list and disable price and cart button. Be sure that Catalog mode is enabled.
It hides the price associated with the product.
Please, refer to Catalog Mode plugin settings for more details.