Don't limit bookmarks search to first 250 items
In list edit, if you use the search function to find a bookmark it will only search within the first 250 boomarks. If you have many hundreds of bookmarks your need to scroll through many pages of bookmarks to find the one you need. This is very time consuming for people with hundreds or thousands of items bookmarked.
The search function should search ALL your bookmarks not just the first 250.

We declined this idea back in 2015 but as part of the New List Edit refresh we have been able to tackle this by the adding of the Quick Add feature into the list itself and the bookmark results are not limited by 250 anymore.
If you’ve not yet seen the New List Edit or the Quick Add feature do raise a support ticket.
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Philip Testa commented
Just concurring with this idea. As the library staff here are currently creating the lists, most of these staff have accrued over 1000 bookmarks. Not being able to search for older bookmarks when editing a list creates frustration in rework.