Hello Wai Yan,
1. We have checked your site. We got your point about the “What We Do” section. Could you please share your WordPress admin credentials it with us on our support email id : [email protected] ? We need it to fix that section.

2. We are going to forward your requirement about the “our-whatwedo” permalink to our technical team. We will give you an update as soon as we get a response from our tech team.

3. We have not tested our theme with any page builder plugins like “Elementor” plugin. Our theme is completely based on the Customizer. You may edit your sections from the customizer.
Thank you.