First we need to understand a number of basic important concepts and definitions that determine how web page content is rendered.

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To only display the Primary Sidebar for certain menu options, you can change this:

sidebar.php

...
    <?php dynamic_sidebar('sidebar-primary'); ?>
...

…into this:

...
   <?php if (is_category('mycategory')) { ?>
        <?php dynamic_sidebar('sidebar-primary'); ?>
    <? } ?>
...

What this does is as follows: if you have a menu option that shows all posts in category “mycategory”, the Primary Sidebar will be displayed.  For all other menu options, the Primary Sidebar will not be displayed.

When using CSS “position:absolute;” statements for a nested <div> element, be mindful which parent <div> is used for anchoring.

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