Affinity Designer: Knife Tool

[Pyanepsion]

Hello, Everybody

The Knife tool is new to me. I would like to cut a desert shape on this set of juxtaposed SVG layers that I found on the internet. How to proceed? Thanks for your explanations.

Here original SVG File. If possible, could you show a video of how you do it? Thank you for your explanations.

 

Desert Landscape Illustration.svg

[Tanya Mau]

Hello, I don't think knife tool can help you with that exactly, because you have an image with multiple shapes.
what knife tool does if divides shapes like an actual knife, it's an amazing new tool, because in v1 if you had to do series of steps to make something similiar to that
how knife tool works:

 

Maybe what you are looking for is a simple mask:

 

Basically you can still use knife tool on your desert image, but you need to clean up layers first, ungroup and remove masks, it must be clean layers only,
but what it will do is divide each shape, and what you get in the end is a bunch of messed up layers, but still the job is done, shapes are divided by knife

[Pyanepsion]

Yes, indeed, and also the gradients can only be changed. I should have thought about it before considering another solution than masks. Thanks you, @Tanya Mau.

[WeronikaSalach]

Interesting, I was looking for a solution to a similar task: I created a vector apple pie asset and I was wondering if I could save time by cutting a triangular slice out of it, and therefore creating 2 assets but faster: