Related topic: How to edit Mobile View : Force24 Support
Let's run through an example of a 2-column snippet that would usually stack on mobile screens at first. This snippet would show the image column on top of the text column by default when first created, but click into the snippet and navigate to the Mobile section editor on the right hand side (as shown below) we can tell Force24: "Keep side by side" for the columns in smaller screens.

You will then want to bring up the mobile view screen, where you can see the current mobile layout of the two columns stacking.

We can then simply click "Keep side by side" and you will see the columns appear side-by-side in mobile view:

Make sure to hit "Save"!
This works for any multi-column snippet, it doesn't just have to be a 2 column one!
If you have more bespoke stacking requirements that can't be achieved purely within the editor, you can still reach out to our Product Expert team via the live chat and they will be happy to assist.