Good request, would be neat to have. Thinking out loud, without yet knowing the answer: I wonder if these could be used to toggle auto-hide on/off per monitor. Will investigate that further when I have more time.
https://docs.microsoft.com/en-us/windows/win32/api/shellapi/nf-shellapi-shappbarmessage
https://docs.microsoft.com/en-us/windows/win32/api/shellapi/ns-shellapi-appbardata

edit:
I tried this AHK script but edited to specify the APPBARDATA structure's second member hWnd to target the taskbar on one of my two monitors (class: Shell_TrayWnd , Shell_SecondaryTrayWnd). But the change still applied to both taskbars. So no success thus far.

Perhaps Display Fusion creates its own individual taskbars that minimic the look and functionality of the native Windows 10 taskbar?

I should also mention that if you're looking to paste a lot of different multiline strings then Lintalist is a good standalone tool. The landing page is a bit daunting but it is easy to use once you get going. There's a DC post for it here.

Also briefly tested the txt-as-md plugin on a test vault.

-Dormouse (March 19, 2021, 05:00 PM)

That's interesting. I see in https://forum.obsidian.md/t/handle-edit-other-plain-text-file-formats-rmarkdown-tex-txt-code-etc/1656/50 that there is discussion about two possible features.
1. Have Obsidian read .txt (and other plaintext) files as if markdown (apply markdown styling, and so on)
2. Have Obsidian read .txt as plain plaintext (no markdown styling)

The plugin does 1 AFAICT. But if this gets wings perhaps both 1 and 2 will get implemented, and maybe also a further feature
3. Have Obsidian read files with extension .NNN as some other, perhaps user customized plaintext format that differs from markdown. For example, AsciiDoc.
That is, users would in a config file tell Obsidian to treat filetypes {.md, .txt} as MarkDown, {.asciidoc, .adoc, .asc} as AsciiDoc, and so on.

Obsidian would expand to be a more general system-of-plaintext-notes editor/viewer. Compare to how VS Code is an editor/viewer for code in different programming languages. That ties in with our previous discussions here for/against the markdown format(s) and alternatives to it.