Step 1: Log in to WHMCS Admin
Step 2: Go to Add-ons > VueJs Whmcs Cart >Setting
Step 3: Click on setting then go to the general setting then you can change the Number of Product groups as shown in the screenshot and click on the save button.
Note: [By default you will see 5 product group in nav 6th product group will be come under More Dropdown.]
Step 4: The Final output will look like this.