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They look plastic, we do not know if they are recyclable.
Could they be recyclable? could they be made of paper? If so, I guess it would be an insert in the box.
If we want them to be reused they must be durable in the dishwasher.
Two options - or return them to the restaurant when we get the next meal (with a small refundable charge, as we used to do with bottles of beer and soft drinks)
or we keep them and use them. Probably for take away it made sense to go with our own, as some do now with coffees.
Attached is a plan for the dining room meal with the note that the dessert should be either in a separate box outside the main package or in a closed box inside the package. However, it is somewhat separated because sweet with fish together in the same place is strange.

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A large box (about the size of 1.5 boxes like the ones we received with the food) and in it they are placed in separate boxes that wedge the walls with fish, vegetables, noodles, dessert, bread and cutlery. The box will close like the one in the photo below. This way the bag is not needed as the whole menu fits in one box. It is also easier to carry, as equal-sized boxes can be stacked on top of each other. In the case of fish, a film (lid in the small box) might be useful to keep the rest from smelling

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The packaging must be environmentally friendly.
To be stable and to be assembled with relative ease
Plastic packaging in combination with hot food is clearly unhealthy and should be avoided.
The ingredients of the meal should be separated 2/3 - 1/3 or 50/50 depending on the amount of each ingredient, so as not to alter their taste through mixing.

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I will try to fold the three packages into two based on my own
meal. Noodles, fish with vegetables and lemon tart. At the base of the first package are placed the noodles on the right side and on the left side there will be a second repositionable compartment-case for the main meal. Also, in it there may be a divider for the main meal and bread. This suggestion only applies to food without liquids. In this case, there should be a third compartment-case.
In this way the two meals become independent. The dessert will be placed on its own in the second package. In general, if the dessert consists of two parts, there could be a divider there as well. Below are the closed and open packaging respectively, with the suggested partitions:

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Transparency on the top of the package would be desirable, so that the consumer has a picture of the contents. This would even make restaurants pay more attention to appearance, which could also help improve quality.