Prestashop 1.6.x. How to manage sidebars

1. In your PrestaShop admin panel go to Modules and Services -> Positions. Find the displayLeftColumn/displayRightColumn Product positions: 
2. You will see the list of modules used for these positions. To edit the modules go to Modules and Services -> Modules and Services. Find the necessary modules and click the Configure button. You can also Enable/Disable them: 
3. In order to make the sidebar appear on the right/left column instead of the default left/right column, go to Preferences -> Themes section and click the Advanced settings button: 
4. Change the default column for the sidebar to appear according to your needs. Click the Save button: 
5. You can activate/deactivate the modules for right or left columns: 
6. Clear the Smarty Cache and refresh your website.

Check this link to learn how to clear Smarty cache.

Hopefully, this tutorial was helpful for you.