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Select Extensions → Template Manager from the drop-down menu on the back-end of your Joomla! installation.
The Template Manager is where you assign a default Template to your Joomla! web site. You can also edit and preview Templates here.
In Joomla!, the visual layout of both the Front-end and Back-end of your site is controlled by the Template. Templates are extensions that contain layout and style information that tells Joomla! exactly how to draw each page of your site.
When you first install Joomla!, one Back-end Template and two Front-end templates are included. Other Templates can be installed from third-party developers as Extensions.
If you want to use the same Template for all of the pages on your site, you just assign one Template as the Default Template. You can also assign different Templates to different pages.
Important: Do not delete the default template files using FTP because it generates an error both front-end and back-end!
Before editing the HTML and the CSS file of the template, it is a good idea to make a backup of the file you are editing.
The Preview will only display positions that contain published modules. To make sure you can see all positions defined in the template, you can create custom modules for them.
You cannot assign the default template to specific menu items.
You can switch between the already installed templates for the Site and the Administrator by selecting the desired template and clicking on the Default toolbar icon on the upper right part of the screen.
The templates listed in the Template Manager can be installed in the Extension Manager from Extensions -> Install/Uninstall menu item. The unnecessary templates can be removed on the Templates tab of the Extension Manager. Only those templates that may be uninstalled are displayed as accessible, the default templates (site and administrator) cannot be removed.
If you hover over the name of the template, a thumbnail image of that template is displayed. Clicking on the template name will present the template configuration screen, which provides all the basic details of the template. Parameters available for configuration appear in the Parameters pane.
Clicking the Edit HTML button will display the basic text editor, which was designed to allow minor adjustments.
If you click on the Edit CSS button on the template screen, the text editor will be displayed with the style sheet file of the template. For a template with multiple style sheets, you can select which one to edit.
Note: The preview of an administrator template does not show you the administrator module positions.