How to remove homepage link and post title from breadcrumbs

This is possible using CSS or jQuery (although this is not very good).

@media (max-width: 768px) {
     .ast-breadcrumbs a[rel~='home'] {display:none}
 }

or:

jQuery(document).ready(function($) {
var responsive_viewport = $(window).width();
if (responsive_viewport <= 768) {
     $(".ast-breadcrumbs a[rel~='home']").css("display","none");
    }
});

This thing: ” ? “also needs to be removed.
I wrote the code as an example only and did not test well. I would not remove these links from breadcrumbs.

Remove “Home” and “?” :

@media (max-width: 768px) {
     .ast-breadcrumbs a[rel~='home'],.ast-breadcrumbs .trail-item.trail-begin:after {display:none}
}

The .trail-end class is responsible for the “post title”

Thanks @zabavljaev This only removes the home link and the ?. Not sure what you mean by .trail-end class is responsible for the “post title”

home link and the ? and post title

@media (max-width: 768px) {
     .ast-breadcrumbs a[rel~='home'],.ast-breadcrumbs .trail-item.trail-begin:after,.ast-breadcrumbs .trail-item.trail-end {display:none}
}

Thanks @zabavljaev That worked! ?? Is there a way to hide the last ? as well?

If you need to remove all separators, then it’s easier to do this:

@media (max-width: 768px) {
    /* Remove "home", "post title" */
    .ast-breadcrumbs a[rel~='home'],.ast-breadcrumbs .trail-item.trail-end {display:none}
    /* Remove all ? */
    .ast-breadcrumbs .trail-items li::after {display:none}
}

or

@media (max-width: 768px) {
    /* Remove "home", "post title" */
    .ast-breadcrumbs .trail-item.trail-begin,.ast-breadcrumbs .trail-item.trail-end {display:none}
    /* Remove all ? */
    .ast-breadcrumbs .trail-items li::after {display:none}
}

Thanks, but I only want to remove the last ? (I put it in bold although it might be difficult to see)
Sometimes I have category ? other times category ? subcategory1 ? and other times category ? subcategory1 ? subcategory2 ? Is this possible?

It tried using
.ast-breadcrumbs .trail-items.trail-end li::before {display:none}
and
.ast-breadcrumbs .trail-items.trail-end:before {display:none}
but it doesn’t work.

Try it like this:
.ast-breadcrumbs .trail-item:nth-child(2n):after {display:none}
: or :: – works the same. Are you sure you really need to cut breadcrumbs? I would not do that.
Experiment with the pseudo-classes: first-child,: last-child,: nth-child (0,1,2 …). Must look with subcategories. Until I see how to do it.
I think, however, that this is not possible, since each entry may have a different number of categories and subcategories. Nothing to catch on.

I can’t choose the penultimate li:after.
remove “post title”:
.trail-items > .trail-item:last-child {display:none}
or
.trail-items li:last-of-type{display:none}