How to enter special character for filtering?

[Hans Hermann Meyer]

Hello there,

I would like to filter dives depending on the cylinder used. I can’t find how to input the letter l (lower case ell) like character for liter. How do I enter that?
I’m on a Mac with macOS 12.4 (Monterey).

And by the way: it would be nice to have the items in the dropdown with the constraints (Filter -> Add constraint) sorted in a more  comprehensible way, like alphabetically.

Best regards,
Hans