Hi @WarrenBelz ,
How many items are in the list
I currently have 5 in the list driving the dropdown box (will increase overtime to maybe10~30). In the list that is being filtered, there will be 2000+ items (exceeding the delegation limit).
are you using any other filters in conjunction with in?
In my actual use case, yes. I have a filter within in a filter in a rough format as follows:
filter(List, ID in filter(...).ID)
The reason I have nested filtering is because there are numerous related lists. I am filtering the 'end list' by a selected element at the 'top list'

I have tried to simplify my question in the fruit example and wish to achieve the below functionality whilst avoiding delegation errors (if possible).
Filter(
'ListB',
IsBlank(DropDown.SelectedItems) || 'GUID' in DropDown.Selected.GUID
)
I apologise in advance for the confusion.