Filter the license table columns for the licenses table in admin.
Parameters: array $columns
The current list of column for license table.
Example Usage: Remove purchase_date column
<?php
add_filter( 'slswc_license_table_columns', function( $columns ) {
unset( $columns['purchase_date']);
$columns['new_column'] = __( 'New Column Title', 'text_domain' );
});