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The idea is being able to easily duplicate a panel (or a whole desktop configuration, widgets included) to other screens. Currently, when adding a new display, we get a blank desktop by default. It is great to have the possibility of having different desktop configurations on different screens, but sometimes we might just want to copy the configuration of the primary screen, and there is currently no way to do that as far as I know. It is still possible to do it by hand, but for heavily-customized configurations it is not a good option.

The ideal would be a "display on all screens" option in the context menu appearing on right-click on a panel. The same could be made with a "duplicate configuration on all screens" option on right-click on the desktop.

I found a few posts asking for this feature on Reddit, the Arch forum and Unix StackExchange but none of them seems to have received an answer so far.

that would be a great idea.. It's not implemented yet AFAIK?

Much required feature! It's a bit silly that you can't have a clock on all your monitors. Being able to have a Window List applet specific to the windows opened on that monitor would also help with organising your applications.