This is based on my experience, as process gets bigger and more and more data items are created, it sometimes becomes difficult to navigate through Tree of Pages, Data Types and then locating the needed Data Item. I am aware of the options to organize Data Item Panel by grouping them based on Page and Data Type but It will be nice to have Search Box for Data Items on Action, Calculation, Decision and other similar stages.
Not sure, if there already is an option to easily locate the Data Item from the long tree structure.
