You're likely not to see this issue, if your layout is 3 columns or less. But more than that, and a few tabs, and Logos goes into 'abbreviation' mode.
If there's no pre-existing abbreviation for the resource (book), it takes the first letter of the words in the title. So, you have 'DEL'. That'd be Dictionary of Ecclesiatical Latin! Pretty obvious, right?
Going to the library and putting in an abbreviation is a headache finding it.
But, clicking on the resource's 3-dot menu (right-side) leads to 'Information'.
Then scroll down to Abbreviation ... type in something meaningful. Click 'Done' and ... you're done!
I've ended up doing a lot of these ... happens quite a bit from opening a search result.
Bonus Points #1: Your abbreviation shows up in the popups for that resource, in other books. Instead of the mystery letters!
Bonus Points #2: In your library, if you often want to pull a book quickly, your abbreviation is recognized in the filter box. Or you can also edit the title too. I often pull up Charlesworth's Pseudepigrapha ... slow going, spelling. OPT1 is faster!