Hi Ella,
Your sidebar is using WP show posts to show the posts, you can change the conditionals of the WP show posts lists at dashboard > WP show posts.
If you want to hide the 2nd and 3rd widget on homepage, try this CSS:
@media (max-width: 768px) {
.home .inside-right-sidebar > *:nth-child(2), .home .inside-right-sidebar > *:nth-child(3) {
display: none;
}
}
If you want to hide the 2nd and 3rd widget on single post, try this CSS:
@media (max-width: 768px) {
.single-post .inside-right-sidebar > *:nth-child(2), .single-post .inside-right-sidebar > *:nth-child(3) {
display: none;
}
}