Mouse Actions not enabled?

Anyone know how to enable or what files need to be installed so say,
i’m using dolphin open a new folder and want to go back to the previous folder I would normally hit the back buttons on the side of my mouse. but in NR this isn’t possible for some reason.

https://bugs.kde.org/show_bug.cgi?id=394529

Plasma5 uses libinput for the mouse:
https://www.mankier.com/4/libinput#Button_Mapping