Help with DisplayArea

[GustavoSouza]

First of all good week to all. Can anybody help me? I wanted this one to always be 100% without the sides.

Where can I modify the creation of these classes?

displayArea disableAnimations fitToPage

How do I choose a percentage in the code below? And not a number?

interface ICustomPageSize extends IPageSize {
    width?: number;
    height?: number;
}

settings: {
filterPaneEnabled: true,
navContentPaneEnabled: true, 
layoutType: models.LayoutType.Custom,
customLayout: {
pageSize: {
type: models.PageSizeType.Custom,
width: 500,
height: 500
},
displayOption: models.DisplayOption.ActualSize
}
}