Hey Maggie,
In order for the Layouter to wrap at certain point, you can set a min width to its items. This way when there’s not going to be enough room for them, it’ll wrap.
If you want to have more control over the amount of items in each row, you can try and change the Layouter layouts between breakpoints. For example have the layout set to ‘row’ on desktop and only on tablet change it to Mosaic.
BTW you can add additional breakpoint for the Layouter and have the rest of the design taken from desktop or copy it from smaller breakpoints (right click → copy from breakpoint).
Hope this helps 