This switch is located at Channel>Channel Settings>Shopify Settings tab.
You can decide which symbol will be used as a category separator for your Shopify channel. This is useful when you want to customize the look of the Shopify categories and there are five to choose from. These are >, |, -, ,, .. You can make your choice from the dropdown menu as indicated in the image below.
IMPORTANT NOTE: This setting will be applied for all channel categories in the related Shopify Channel.