All product variations are showing

Hi,

I am running into a problem with a webshop I am trying to create.
The webshop is going to sell beds with various types and sizes.
I have for example 3 types of beds:
Single bed, double bed, queen bed.
I have created sizes that belong to each of these type of beds.

The issue is, that on the frontend on the product pages, each of the sizes can be selected in the dropdown list, even though I have created variations of the types with the sizes that belong to that type of bed.

How can I make it so that only the applied sizes show up in the dropdown when a type of bed is selected?