As a Pluma user migrating to Geany... I'm used to this 'Do not split words over two lines' option being unticked...
Essentially it means that when you've got "Line wrapping" turn on... that it shouldn't consider the placement of words to know where to split for the new line... instead it just splits when you're out of the room for characters.
I know this doesn't sound particularly intuitive for the user. But when you're dealing with a lot of bash scripts with incredibly long (and dense, thus not a lot of spaces) and nested lines of code... it becomes handy to just wrap when you're out of room... not to wrap when there isn't enough room for the next "chunk".
Hope this makes sense.