A WordPress child theme is a theme that inherits the functionality of the parent theme. With a child theme, you can make modifications or add additional functionality to the parent theme. The child theme offers the safest and easiest way to modify an existing theme, whether you want to make a few small changes, or extensive ones.
XStore fully supports Child Theme.
The child theme is included in the theme package. Find the XStore-child and upload it to the /wp-content/themes/ folder.