This is done via the theme. Some themes (not all) have Page Templates. If you edit the page where the [ESPRESSO_EVENT] shortcode is and check on the right for “Page Attibutes” and Templates and check the dropdown box to see if you have a Full Width (or similar name) template.
The support post ‘Registration Page Width’ is closed to new replies.
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Support forum for Event Espresso 3 and Event Espresso 4.