Screenshots of an updated version of the OneDrive sync client for Windows 11 have leaked on Twitter, posted by @flobo09.
The new client features Windows 11-style design and appears to be in A/B testing.
The tabbed design is gone, with new horizontal sections serving the same purpose.
The design is now more modern, but besides the design update, some elements, such as the network tab and Office tab appear to have been dropped. The settings are however still available in other sections.
If you want to give the design a try, you need to download the latest version of the sync app, and also hope Microsoft includes you in the A/B testing. Otherwise, you need to wait for the public roll-out, which should not be long.