@3dasp Yeah, phone landscape layout is a total bear!
It looks like the margin and padding of some images or text might be what’s causing stuff to break at smaller displays sizes.
I’d suggest removing the height values for your images and instead use the width values to dictate their size. Or use the height values only. The normal ratio of a placed image will be retained when using just one value (height or width).
When in the mobile breakpoint view, I adjusted some things on your columns. See the screenshots to see if this might help.
First, with the column selected, go to settings and see if changing Columns Options helps. Sometimes it does, sometimes it doesn’t depending on content.

This shows the values of the Columns for the Phone Portrait layout. The size of the inner category nav bars need to be reduced, but this seems to help. Of course I can’t publish it to really see if it helps.

Sometimes you can just get rid of certain width or height values and leave that area blank. Unless of course it really matters. Often just setting a width and a max height is all ya need. Even then, sometimes the only value needed is a width.
Bah, hope this kinda helps.