Scrolling for child form in C #

In winform, it has child forms, and I use these codes to sort:

this.LayoutMdi(MdiLayout.TileHorizontal);

But there is a question. This form has 4 child forms when I use this code to be sorted, but there is no scroll or anything else in the child form so that users can see all the form controls. I want to know how to use the scroll bar when the form is smaller, we can scroll the child form and see all its controls.

Thanks in advance