If you add more items to a text-list than can fit within the size of the text-list, it doesn't add a scroll bar.
If there are already too many items in the text-list when the program is run, then there is a scroll bar. But when you remove items, the scroll bar stays the same size.
R E B O L [title: 'test']
view center-face layout [
a: text-list 200x100 data ''
guide
btn 'add item a' [append a/data '*'] btn 'remove item a' [clear back tail a/data] return btn 'show a' [show a] btn 'reset-face a' [reset-face a] return
b: text-list 150x50 data ['*''*''*''*''*''*''*''*''*''*']
btn 'add item b' [append b/data '*'] btn 'remove item b' [clear back tail b/data] return btn 'show b' [show b] btn 'reset-face b' [reset-face b] return
]