Remove Item Limit when using Look Up Field in Nintex Form with View name
In case of SPOL OOTB list, when you add a List Look Up, SharePoint does not provide an option to enter the View name. And in the default OOTB form, all values are visible in the dropdown just like Nintex Form.
Nintex provides an option to provide a view name. And if we provide a view name, it is fetching only items shown in the First Page of the View.This should not be the case. Please remove the item limit.
Steps to reproduce:
1. Login to a SharePoint Online site collection with Nintex Forms installed.
2. Create a Custom List (name: MasterList) and add 20 items viz. Item1, Item2 etc in Title field.
3. Set the “All Items” view Item Limit to 5.
4. Create another Custom List (name: ChildList).
5. Add the MasterList as Look Up Column to the Child List.
6. Customize the Child List in Nintex Forms. Select the Look Up Dropdown. Add “All Items” view as Source View.
7. Publish and verify.

Thanks for your suggestion.
I will update the ticket if we have anything to share on this idea.
Cheers,
Euan