How would I fix these “secondary titles” to show the whole title and not cut out with … ?
What is your distro and plasma version ?
I don’t reproduce in Plasma 5.27.
Plasma 5.27.10 on Arch.
The text length doesn’t seem to matter e.g.
I don’t reproduce in Arch , plasma 5.27.10 in breeze with default theme (but I doubt that has anything to do with it).
This is known bug in Qt 5 when you use a fractional font size. Switch to an integer font size or upgrade to Plasma 6 once it’s released in 2 weeks.