Can you tell me why having this type of url shows a horizontal scroll bar in the yellow preview box

https://www.example.org/support/firmware/555744456567556dfd45.html

It seems to be for all url's that have a forward slash then a word then a forward slash then a word after the main domain

/support/firmware/

Whereas adding a hyphen automatically resizes the url in the yellow preview box

https://www.example.org/sup-port/firmware/555744456567556dfd45.html