umenu dropdown width too narrow in MIRA

Unless I am missing something, it looks like the width of the dropdown umenu is fixed when viewed in MIRA.

I am using umenus to create playlists of music tracks with long names and, when I scroll through the items (in dropdown), I can only view 16 characters—even though the width of my umenu is actually bigger. I can see all the items in full width when I drop the umenu in the Max patch, but not in MIRA.

Is there any way to increase the width of the dropdown in MIRA? Or is this simply a wishlist feature to be requested?

Thanks!