Idea Summary
It would be a significant and welcome change if the framework's item selector were updated.

Use Case
Many times, we need to select multiple items, but it's only possible to select one at a time, which makes the process slow and prone to errors — for example, selecting the same item more than once, since it's not possible to view all selected items.

This idea could be applied across virtually the entire framework, as the selector appears in various places and its improvement would reduce clicks and errors.

Preferred Solution (Optional)
The ideal solution would be for the user to see a list of the page items and simply check the ones to be used via checkboxes. Then, the selected items could initially remain hidden, and when the user clicks, for example, an arrow next to "Page Items to Submit", the region would expand to show everything that has been added.

Alternative solution: Use the same component as the static LOV (List of Values), allowing the user to add one item per line. After selection, the user would see a button displaying the selected items.