Setting dimension of detail modal form in a Editable Grid View and hide head buttons

Hi all,
I need to enlarge a bit the modal form that opens when you click on pencil detail of a row of editable grid form.
I’ve searched but not able to find where to set dimension in order to see all header buttons.

Another problem could be to hide a couple of buttons present on header that have meaning only if you look at all the rows of form not to singular one.
Thanks

OK sorry… under setting… !!!
[SOLVED]