Whenever a product is set to ‘pre-order’ mode, by default the plugin replaces the ‘Add to cart’ button with a ‘Pre-order’ one. For this new button, you will be able to customize the label as well as the colors, let’s see how we can configure it
First, you need to go to YITH > Pre-Order > ‘Customization’ tab. Here you will find the ‘Pre-order button label’ field to enter the label of your choice:

Below this field, you will find the option to decide whether you want to further customize the button’s colors or not:

If enabled, you will be able to set the color for the background, background hover, text and text hover:
