Bricks enables us to conditionally output elements if a basic ACF field type like Text has value by selecting it in the Dynamic data condition with != and leaving the value input empty.

With the above condition applied, the element will only be output if the custom field named header_notice
created with ACF is not empty.
What about the case when the field type is a little more complex one (that returns an array) like the ACF Repeater?
We need to define a custom function that returns either true (1) or false (0) and check against = 1 (to check if not empty) or ! = 1 (to check if empty).
Add the following in child theme‘s functions.php
or a code snippets plugin:
// Function to check if the given ACF Repeater field has any rows of data.
function bl_have_rows( $field ) {
// if ACF is not active, return false
if ( ! class_exists( 'ACF' ) ) {
return false;
}
return get_field( $field ) ? true : false;
}
and use it like this:

{echo:bl_have_rows(site_builders)}
Replace site_builders
with the name of your ACF Repeater’s field name.
With the above condition in place, the Section will be output only if a ACF Repeater having a field name of site_builders
has at least 1 row of data.