The size of input fields in Genio is given in terms of characters. This can be further customized using the "scroll" property of form fields, i.e., two fields can have different widths like 100 and 150 but you can set the scroll property to the same value, like 80 for example (scroll obviously needs to be lower or equal to the smallest width). In the form editor this property is called "Caracters".

All of this assumes the fields are of the same kind. It makes no sense to try and make a date input the same size as a text input or an image input.

Also note than for responsive web interfaces like MVC this character size is only a hint and will be further converted into categories like small, large, extra-large, that have predefined sizes in CSS styles because they need to be adjusted according to the display device screen size.