In the web editor, when I open the user library from within the message (red arrow on screenshot - in this case, CC) the default number of entries displayed is 5. All 16 of my entries fit nicely on a 13" laptop screen so suggest default could increase to 20 to save a mouse click each time.
It’s a killer feature this, soooooo useful!
This screenshot from bank settings, for context.
And at the risk of being greedy, it would be great to be able to sort the library by column headers… and for bonus credit, whatever sort order is “stored” in the ‘main’ user library screen to be used in this pop-up instance…