Regardless of how you stretch your properties widget horizontally, the names get truncated the same way, even though there’s enough space to display the entire name.
The only way to fix this appears to be to delete the name, and re-paste it after the widget has been stretched horizontally
Addendum: seems like this issue is when you update the properties widget while the horizontal sizing is too small to fit certain attribute names, until you select something new or use the mentioned fix, it will always appear truncated to starting horizontal size
@aaron_mccoy we’re working on a new Explorer and Properties panel that will be rebuilt from the ground up.
I’m closing this ticket because we won’t fix this in the current version, but instead address it in the new Explorer and Properties panel. Please bear with us, it will be a massive improvement.