Where do I look to customize the /jobs page? I am having trouble finding where it is so I can modify it

Greetings,
I am trying to find where the /jobs page is generated.
The current default layout is unusable for our sites that have many job openings, so I wanted to see what my options are for modifying it, but I can’t see to find where it is located.
Appreciate any guidance.
Thank you!

how you completed this?