Alternatively, you can click Select All. This will add all pages to the collapsed menu.

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How to create a collapsible side menu in WordPress
You can create a collapsible sidebar menu in WordPress using the Bellows Accordion Menu plugin.

Bellows Accordion Menu provides a tongliao phone number convenient shortcode to place an accordion menu on any page, post, or widget area, including the sidebar.

Collapsible sidebar menu in WordPress.
First, you need to install and activate the Bellows Accordion Menu plugin. If you need help, check out our beginner’s guide on how to install a WordPress plugin.

Disclaimer: Please note that this plugin has not been updated with the last three versions of WordPress. However, we have tested it live on our website and it works great. For more details, see our guide on using outdated WordPress plugins.

After activation, visit the Appearance menu page in your WordPress dashboard.

Create a menu in your WordPress dashboard.
First, enter a name for your menu in the "Menu Name" field. Note that site visitors will not see this name as it is only a referrer.

You can then click on the "Create Menu" button.

Then, select the pages you want to add to the collapsible sidebar menu. By default, WordPress only displays recent pages.

If you want to see a list of all pages on the site, click the "View All" tab.

Add page to WordPress menu.

Once you are satisfied with your selection, click the "Add to Menu" button. You can also select post and blog categories or add custom links. For more details, see our guide on how to add a navigation menu in WordPress.

Once all web pages have been added to the menu, you can move them by dragging and dropping them. Doing so will change the order in which pages appear in the accordion menu.