Child components goes beyond Parent

As you can see here, the child components are getting out of the parent layout screen. It is width is beyond the the parent. How to let the child componenets not to go beyond its area
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In most cases that’s due to missing setWidthFull() – it’s generally a good practice to set that (or setWidth("100%") which does the same thing) on any and all components that are expected to take exactly the full width of their parent. (Note that the parent also needs to have a width for that to work reliably, and that’s often 100% too.)