For Joomla 5, we recommend to using the default Joomla template (Cassopia) and style it to your liking. That way it stays fast, stable, mostly compatible with future Joomla versions, and secure, as there are no third-party template-specific overrides (PHP files) which might not be kept up-to-date with security.

Then, of course, you have many options from template providers. Keep in mind that manye templates with a template framework are heavy on the browser load and communication bandwidth, both taxing site speed.

Suggest posting on the Joomla forums for general questions regarding Joomla. We only provide support for Community Builder itself and our addons. You will likely need to apply custom CSS or a layout override to adjust alignment of module positions, etc.. If you use a CB Content Module it will allow outputting custom CSS in addition to your HTML so that might be a place where you can do this otherwise you'll need to look into Joomla template custom.css functionality.