This is how my desktop looks after the update, the top bar turning grey and the addition of the bottom bar happened after the update.
From my searching of screenshots this does not appear to be how it is supposed to be. Is there any way to fix it?
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It seems you have somehow logged into a GNOME classic session.
Reboot and after entering your password click on the cogwheel (⚙️) next to the sign in button.
It should show you different available sessions. Try "Ubuntu" (or Ubuntu on Xorg) or "GNOME" (or GNOME on Xorg, but not GNOME Classic or GNOME Flashback or anything else) session.