In Drupal 7 there was a possibility for Primary and Secondary menus and their configuration so that the contents of the Secondary menu is the result of the selected option in the Primary menu.
The Menu Block module did a similar job
Is there a technique or module that allows similar functionality in Backdrop CMS?
I don't want to use a drop-down menu for my purpose because the drop-down menu is hidden after moving the mouse cursor, but the Secondary menu is permanently open until the selected option in the Primary menu is changed.
Thanks in advance for the advises and tips!