It appears that the website is utilizing a grid system similar to or another comparable system.
You should have the ability to modify the width class specifically for that page. For instance, the home page may have a body class of .home or .page-id-2115, while other pages will have similar body classes.
.grid-stack.grid-stack-2>.grid-stack-item, .grid-stack.grid-stack-2>.grid-stack-item[data-gs-min-width='1'] {
min-width: 100% !important;
}
or
.grid-stack.grid-stack-2>.grid-stack-item[data-gs-width='1'] {
width: 100% !important;
}
You may need to inspect the grid structure on the specific page where you intend to implement these changes. The method I described earlier, involving the body class like page-id-5275 and the aforementioned classes, should be effective. It's possible that both adjustments will need to be applied together to override the existing CSS. These modifications can be incorporated into your child's CSS file and should produce the desired outcome. Without direct access, it's challenging to provide precise guidance, but based on my familiarity with these plugins, they typically rely on CSS rules to determine width and subsequently calculate height for the grid layout.