Hi @jichao2024,
Loop Grid is an Elementor Pro widget. Since you are an Elementor Pro user, you can open a support ticket at my.elementor.com.
ref: https://elementor.com/help/how-to-submit-a-support-ticket/
I’d also suggest you check out Elementor Community Group on Facebook. We have created it to connect Elementor users together and share knowledge, Global Elementor Community.
WordPress.org rules state that commercial products are not supported here.
Thank you for your understanding and cooperation.
Kind regards,