Disable default label

[TaiJuWu]

Current implement have default label and default value as below:

xs_label: 'size/xs'
xs_max_size: '10'
s_label: 'size/s'
s_max_size: '100'
m_label: 'size/m'
m_max_size: '500'

Could I disable size/s and size/m? I just need size/XS.

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