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From Elxis Official Documentation
Modules in Elxis are displayed inside placeholders called module positions. These placeholders are defined in templates. Placeholders are identified by names. By default Elxis comes with a number of predefined names that you can use when developing templates.
Create a new module position
To create a new module position in your template, you insert this basic code into your template's index.php file in the exact area you wish your assigned modules in this position to be displayed.
<?php mosLoadModules('position_name_here', -2); ?>
Where position_name_here is to be changed to whichever position you define on this page (for instance "leftmodules"). The second parameter, -2 in this example, defines the modules style. -2 means that the modules will be wrapped inside an external DIV element having a CSS class named "moduletable" (default style in Elxis).
Now that you defined your new module position in your template you should also define this position in Elxis administration in order to be able to assign modules in this position later on.
Navigate to Site -> Templates manager -> Module positions
You will see a list of existing module positions. Write the name of your new module position in any of the blank fields and click save. You can also write a short description for your new position if you wish.
Assign modules to a module position
Modules can be displayed in any module position in your template. To define where a module to be displayed navigate to the modules manager (Elxis administration -> Modules -> Site modules) to see the list of the existing modules. Click any of them to edit it. In module's edit page you will see an option to set the module's position. In this list there will also appear your new module positions (if you have created any). Select your desired position. The module will be displayed in this position from now on. Simple, ah?
Visualize all the positions of your template
You may visualize your Home page with blocks displaying the positions used in the template assigned to the Home page by navigating to Site -> Preview -> Inline with Module Positions. This representation of your site might be very useful.