Menu not displaying sub-pages

Hello, I have a page titled "Services" that is the Parent to 4 other pages (when I created the 4 pages I did specify "Services" as the parent page). In the main menu, there is an icon next to "Services" to indicate there are sub-pages, but when I hover over or click on "Services" in the main menu I am not able to see a list of the four sub-pages in order to access them. How can I get to these sub-pages, can there be a drop-down menu when the cursor hovers on "Services" or by clicking on the drop-down icon? website is: https://www.cadencequalification.com/ Thank you