In short: The delete row/column option in the right-click menu of listboxes should also allow you to delete all rows/columns (or "Clear Items List") in one go.
I typically get into this problem if I am filling a listbox with items programmatically. Before I save the VI and distribute it, I do not want it to contain all those items. I want it to be empty. So I right-click on the list and expect an option to clear the items list, but the only option available is to delete one row or column at a time. An impractical if not impossible task if the list is of any size. Today I end up doing it in code. I run the code once, remove it - and run into the same problem after the next run and save...
Example:
PS. This is a good candidate for JKIs Right-click framework too, but I think it deserves a place in the in-built menu.
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Available in LabVIEW 2015 and later