When enabled, the Catalog Mode option will turn off the shopping functionality of WooCommerce, allowing you to use it for cataloging purposes only.
To enable/disable it, navigate to Appearance> Customize > Shop. This is what you should be seeing on your screen:
By default enabling Catalog Mode will remove the Add to Cart Button and Product Price. You can choose to have the Add to Cart Button and/or Product Price visible.
Here is how to enable Catalog Mode and keep the Add to Cart Button active.
Here is hot to enable Catalog Mode and keep the Product Price visible: