eldritch mouse

I'm working in publisher, and I've noticed that double clicking on a word and then dragging should expand the selection to entire other words, but it doesn't seem to be functioning? Ctrl + Shift + Arrow does work as intended, but it seems like the mouse doesn't have the functionality? Is this a bug or just a feature that doesn't exist? It's a pretty fundamental part of my workflow. Affinity Publisher 1.10.4.1198