Acacia supports a simple coming soon or offline style page with a time counter. It has been specifically styled to match the theme. This feature can be enabled in Admin Dashboard → Acacia Theme → Gizmos → Coming Soon Page. You can customize this page by editing the comingsoon.php file inside the theme folder. Please visit Acacia tutorials for more information.
You can still access the frontend of the site by logging in as an administrator below. You can customize this message in the Acacia theme language file.