Hi there,
couple of choices:
1. Make the CSS selector morre specific eg.
.sidebar ul li::before
this will only effect lists in the sidebar.
.entry-content ul li::before
this to apply only to the entry content of the post.
You can string the selectors together eg.
.sidebar ul li::before, .entry-content ul li::before {
/* CSS Rules here */
}
2. Exclude the .menu class from your selector:
ul:not(.menu) li::before
This applies to all UL’s unless they have a menu
class