How to assign Masonry only to main blog?

Hi there,

You can use this function to enable masonry on specific categories:

add_filter('generate_blog_masonry','generate_blog_enable_blog_masonry');
function generate_blog_enable_blog_masonry()
{
        // If we're on a category named "Category Name"
	if ( is_category('Category Name') )
		return 'true';

        // If we're on a category named "Sports"
	if ( is_category('Sports') )
		return 'true';

        // If we're on a category named "Tech"
	if ( is_category('Tech') )
		return 'true';
	
        // Otherwise, disable it
	return 'false';
}

Adding PHP: https://generatepress.com/knowledgebase/adding-php-functions/

It works if I disable Masonry in Admin, thanks. Now how to get Masonry for home page latest posts?

Just have to add a is_home() check in there:

add_filter('generate_blog_masonry','generate_blog_enable_blog_masonry');
function generate_blog_enable_blog_masonry()
{
        // If we're on the blog
        if ( is_home() )
                return 'true';

        // If we're on a category named "Category Name"
	if ( is_category('Category Name') )
		return 'true';

        // If we're on a category named "Sports"
	if ( is_category('Sports') )
		return 'true';

        // If we're on a category named "Tech"
	if ( is_category('Tech') )
		return 'true';
	
        // Otherwise, disable it
	return 'false';
}

Perfect. Thanks.

No worries, glad I could help :)