Hi @ZRK ,
Do you mean that list is updating at the same time? I think ClearCollect is required, have you tried use Timer control to complete press ClearCollect manually?
Or you just don't want to press the ClearCollect function every time, you can combine two list on OnVisible of screen or OnStart of App firstly, the use the Filter.
OnVisible of Screen.
ClearCollect(COL,ShowColumns(List1,"XID","ColumnName1","ColumnName2"),ShowColumns(List1,"XID","ColumnName1","ColumnName2"))
Items of Gallery.
Filter(COL,XID=TextInput.Text)
Best regards,
Rimmon