How to change checkout and cart page?

Like where do i even find it? I have pre-installed theme and it comes with a pre installed checkout and cart page already but I want to change it to something else and i found this plugin “CartFlows” that lets you customize those pages however you want. But when i create the checkout page on cartflows plugin i cannot find how can i change the new checkout page created with cartflows? EVen when i go to “Pages” my cartflow page doesnt appear. This is just so confusing in general because originally you cannot edit your checkout page at all you need to install more plugins to be able to do that. I feel like it should be a default to be able to edit checkout. Its just plugins on top of plugins and on top on plugins and it feels like they all do the same thing.


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