how to use expand and collapse in search page for subcategories.

there are many subcategories in search page so whole page covered by subcategories only so i want to use coding for expand collapse then user can easily see all listing .. when they will click on Expand then all subcategories will display.

@ishan
https://forums.mb-themes.com/veronika-osclass-responsive-theme/how-to-hide-under-the-curtain-half-of-the-subcategories/