Adopt a more 'elegant' style for scrollbars on Mac
Plugins, Layers and Assets panel at its minum width is a very narrow column on Mac. I think scrollbars are too large, also for XD's properties panel.
It would be great having narrower scrollbars, as thin as in Windows or in the font menu, even better with a show/hide effect.
Closing this as per OP. :)
Thank you, Elaine,
changing settings in System Preferences has solved!