You should always check how your listings look on your own mobile device, to see if there’s anything you could improve.
Another option is Device Mode in the Chrome Internet browser. Go to one of your listings and press Ctrl+Shift+I. After you've opened Device Mode, you may need to add an m at the beginning of the page URL, for example, m.ebay.com.au. You’ll see how the current page looks on mobile, and you can select different devices and screen resolutions using the menus at the top.