.cs

User()
  .Include(u => u.UserPreferences)
  .Select(u => new ProfileVm {
      FirstName = u.FirstName,
      LastName = u.LastName,
      Email = u.Email,
      Phone = u.PhoneNumber,
      UserPreferences = new UserPreferencesVm
      {
        IsTall = u.UserPreferences?.IsTall,
        IsSmall = u.UserPreferences?.IsSmall,
        IsSomething = u.UserPreferences?.IsSomething,
      } ?? null
  })
  .FirstOrDefaultAsync(u => u.Email == email);