csharp
public class DecoratorEntityServiceListViewDisabler : IEntityService
{
    private readonly IEntityService _decoratee;

    public DecoratorEntityServiceListViewDisabler(IEntityService decoratee)
    {
        _decoratee = decoratee;
    }

    // ... implement interface through _decoratee

    public IEntitySlim? Get(int id, UmbracoObjectTypes objectType)
    {
        var result = _decoratee.Get(id, objectType);
        if (objectType == UmbracoObjectTypes.Document && result is DocumentEntitySlim resultDocument && resultDocument.ParentId == -1)
        {
            // Disable isContainer
            resultDocument.IsContainer = false;
        }

        return result;
    }

    public IEntitySlim? Get(Guid key, UmbracoObjectTypes objectType)
    {
        var result = _decoratee.Get(key, objectType);
        if (objectType == UmbracoObjectTypes.Document && result is DocumentEntitySlim resultDocument && resultDocument.ParentId == -1)
        {
            // Disable isContainer
            resultDocument.IsContainer = false;
        }

        return result;
    }
}