Shallots and salad leaves

In one pot is just shallots, planted in a nice circular design. In the other there is a cross of salad leaves with shallots in each quadrant. This was fine while the plants were small but now the shallots are so big, the salad leaves are hard to harvest as they are hidden. Even so we have had three cuttings so far and they tasted wonderful.

I would like to sow more like they recommend but i simply don't have the space. Once the patio is cleared then i will be able to expand.