filtering objects by inner collection property value - LINQ, C#

Question

I haven't used LINQ for a while and things got forgotten.

How would one filter panelInfoModels by Exists value? The query below returns the same collection (does not apply intended filtering).

var q = (from p in panelInfoModels
                            from u in p.UUTInfo
                            where u.Exists == false
                            select p).ToList();

public class PanelInfoModel
{
    public string Sn { get; set; }
    public List<SubPanelInfoModel> SubPanelInfo { get; set; }
    public List<UUTInfoModel> UUTInfo { get; set; }
}


public class SubPanelInfoModel
{
    public string Sn { get; set; }
    public int Sequence { get; set; }
    public List<UUTInfoModel> UUTInfo { get; set; }
}


public class UUTInfoModel
{
    public string Sn { get; set; }
    public int Sequence { get; set; }
    public bool Exists { get; set; } = false;
}

Thanks

Answer 1

Check if this query corresponds to guessed expectations:

 var q = panelInfoModels.Where( p => p.UUTInfo.All( i => !i.Exists ) ).ToList( );