woocommerce/plugins/woocommerce-blocks/assets/js/base/components/title/style.scss

// Extra class for specificity to overwrite editor styles.
.wc-block-component__title.wc-block-component__title {
	@include reset-box();
	@include font-size(large);
}

// For Twenty Twenty we need to increase specificity a bit more.
.theme-twentytwenty {
	.wc-block-component__title.wc-block-component__title {
		@include reset-box();
		@include font-size(large);
	}
}