Bootstrap.css in Sensitive theme, how is that linked?

Normally I manually duplicate a theme so I can make edits to the child, but with Sensitive I was running into problems so used a plugin to duplicate it for me. Now I’m finding that only parts of the theme were duplicated, and the child theme is pulling some CSS from the parent theme (and God knows what else). I just found this out when I saw that the mobile version’s navigation was unreadable and was trying to figure out how to change it. The style sheet that’s being imported is themes/sensitive/bootstrap/css/bootstrap.css, when it should actually be themes/PlantekSensi/bootstrap/css/bootstrap.css.

My question is, where do you suppose the import link to the bootstrap.css is located? Which document? I’d like to change the link to it. I know that if I want to add new css I can put that in style.css. Does it make more sense for me to create a new style sheet to override the one that’s currently being imported?

The site is here https://plantekinc.com/