The dark mode theme is a pre-release feature and you’ll have to enable it during the upgrade by selecting Console dark theme as shown here:
Before we look at the new theme, let’s take a look at what the default console looks like just after the upgrade.
To enable dark mode (a pre-release feature) simply click in the top most menu (top left) and select switch console theme.
The change to dark mode is instant.
After restarting the console, it will still be in the theme you switched to, and you can start browsing the nodes as normal. Much easier on the eyes for those of us that are sensitive to bright light.
To switch back the theme to the default, simply navigate to the Switch Console Theme option as before, then restart your console when prompted (why are we not prompted in the first switch ?)