I have just installed Magento 2.2.3 in my system. I have also added few categories and that of products. I can see a bigger image when I have clicked on it and it has been closed when I clicked on "X" (close) button. But when I checked in responsive design I am not able to close that image by clicking on close button. I have found the same issue in Magento 2.2.4 also.
Can someone please help me where the actual issue is ?