In list view there is no way to find a task by Custom Task ID. I tried "Filter by task name..." search bar with no luck, I also cannot add a filter for Custom Task ID. It does show up in global search, (but only if you use the exact task id with prefix). But I want to search just the list I'm on.
So we end up putting the custom task id in square brackets at the start of the task name. lame but it works. (but then in other views it gets doubled up and shows twice.) For example:
"[DEV-1232] My task title".