It may just be me, but I’m not a fan of the hovering on a category changing the displayed menu. Multiple times I’ve not realized I hovered over a different icon than the category I selected and had a different set of menus than what I was expecting. Personally, I’d like to see this go away and require a click to change the category of menus shown.
Example of Diagnostics clicked, but connections was hovered for a second before moving over the menus: