Nevermind. In case anyone's as dense as I am:
Right click the taskbar -> Multi Monitor Taskbar -> Position -> Disabled

I was as dense. Thanks for posting the solution. I looked for at least an hour!

If one has accidentally disabled a specific taskbar, how does one re-enable it?

In my case, I have a monitor with 4 sections (and 4 taskbars). I disabled one by accident.

UPDATE: Found my answer

1) Right-Click on a DisplayFusion Taskbar and select Settings
2) Click the Taskbar option (from the left).
3) Towards the bottom right, click on the Enable All Taskbars button.

Wallah! My missing taskbar is back.

I was also dense. And I even saw that option but "disabled" for whatever reason didn't register.

I have two monitors. I expect both monitors to have the displayfusion taskbar when I "enable multi-monitor taskbars" but I still have a windows taskbar in one monitor. (When I rightclick on one taskbar, I get the displayfusion settings for taskbar; when I rightclick on the other taskbar, I get the windows settings for taskbar)

Version 9.9, recent clean install.