Have you checked these first?
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I have defined a few Lists added them to the ticket form and pulling them through as columns in the Open Queue.
This is all working and showing the correct value, but for every custom column a blue box with a tiny info icon is appended which in some cases causes a line feed and just looks messy. What is it's purpose (other than to show some a tool tip containing the same text that is in the column) and how can I get rid of it?
osTicket v1.15.4 running in Chrome and Edge.

This is the source behind the Finding : Regulation cell contents

The icon didn't seem to add anything for us, so I opted to remove it for now. Just in case anyone else wants to do the same, edit /include/class.list.php
Modify function display() to the following implementation:
function display() {
return sprintf('%s', $this->getValue(), $this->getListId(), $this->getId());
}
Thats great! Thanks for the heads up 🙂