ARAS 12 - Force to take all the available place

For an ItemType without relationship,  ARAS 11 lets all the available place for the display of the item.

See my ItemType in ARAS 11:

But with ARAS 12, this is not the case.

See the same ItemType in ARAS 12:

Is there a solution to force the "Costing Context" to take all the place or to remove this frame ?

Thank you in advance for your help?

Regards.

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