Magento does not allow hiding the "Add To Cart" button from the product page by default.  The only way to disable the customer's ability to order a product is to hide the product on the store.  However, what if the product is out of stock temporarily?  Hiding this page will distort the SEO ranking position of the product page which may disappoint your customer who added this item to their wish list. 

Hide Add To Cart Button by Eltrino saves the product page from hiding.  It disables product orders by removing the button.

Features

• Hide (remove) "Add To Cart" button from the product page
• Disable product orders
• Apply to one or more product
• Save product page from hiding

How to Hide Add To Cart Button video

Version number:  2.3.8

   Features and updates:

Compatible with Magento 2.4.2

Version number:  2.3.7

   Features and updates:

Fixed access array offset error

Version number:  2.3.6

   Features and updates:

Added CSP support. Created a new template for cross-sell products

Version number:  2.3.5

   Features and updates:

The module checks each product in the cart on the checkout if it is available for purchase. Otherwise, it will show warning messages "Some product is not available for sale. See shopping cart"

Notice:
If you want to hide the "Add To Cart" button for a grouped product, you also need to hide the "Add To Cart" button for each simple products, that are part of the group
This version doesn't hide the "Add To Cart" button of a simple product (specific product configuration) inside the configurable product. It just disables adding to the cart of such configuration.

Version number:  2.3.0

   Features and updates:

- This version is compatible with Magento 2.3