[Support request] How to modify the read-more link on a particular page?

Here is my current code, very cleaned. I use the Search & Filter Pro plugin, and I try to modify the display results template.
On a page, I have in a column my search form and on the right the result of the query created by selecting checkboxes in the search form.
When my request selects for example 3 posts, I wish, by clicking on the title or more button to open the complete post on a page, with in a column a list containing the 3 titles of the posts of my selection. This allows to navigate in the result of my selection …
I was wondering how to move the list of posts from my selection from one page to another … I imagined by a variable GET, but there is perhaps a better solution, simpler, or more elegant …

<?php
/**
 * Search & Filter Pro template
 */
// GET ALL THE IDS OF THE SEARCH RESULT 
if ($query->max_num_pages == 1) {
    $idsurl = '?ids=';
    while ($query->have_posts()) {
        $query->the_post();
        $idsurl .= get_the_ID() . ',';
    }
    $idsurl = rtrim($idsurl, ',');
}
// DISPLAY THE SEARCH RESULT AND PASS ALL THE IDS TO THE SINGLE POST PAGE IN GET URL ATTRIBUTE 
if ($query->have_posts()) {

while ($query->have_posts()) {
        $query->the_post();
        ?>
<div>
    <h2><a href="<?php the_permalink(); // ADD HERE THE IDS IN THE URL
        echo $idsurl; ?>"><?php the_title();?></a></h2>
    <p><?php the_excerpt(); // HOW ADD THE IDS IN THE MORE BUTTON URL ????   ?>
    </p> 
</div>
<?php
}
?>