Thank you for this and is it possible to always show panel on secondary monitor?

[xjvs]

I have no knowledge about gnome extension development, probably there is a good reason that show panel on secondary monitor only when the primary is in fullscreen mode, but I still want to ask whether it's possible to implement the feature of always showing the panel on secondary monitor?

And thanks again, great job.

[Noobsai]

You can change your primary display in the displays options:

[xjvs]

I want the top panel show on both primary and secondary monitors, and not only when primary is in fullscreen mode.
But feel free to close this if this sounds not reasonable to you or there are some technical difficulties of implementing this.

[Noobsai]

Sorry, I initially misunderstood the question.
Something similar to what you asked does Multi Monitors Add-On (only for gnome shell ≤3.38). If you want v40 look this PR.
For your request an extension should creates a panelBox with all inner controls (see mmpanel.js). But I don't know how other extensions will work with this custom panel. There is a lot of works and is not related to the idea of my extension.
My extension just moves the original panel to the secondary monitor by coordinates. I recreate hot corners only (because I cannot move them).

[xjvs]

I see, thanks for the info, closing this.

[realh]

Sorry for resurrecting a closed issue, but I'd just like to point out that it's fairly easy to show the panel on the secondary monitor instead of the primary, as opposed to both. I've just made a new panel-mover extension based on this one, which lets you move the panel manually. I wanted this because I play Trackmania Nations Forever in WINE, and it doesn't interact properly with mutter, so neither multi-monitors nor fullscreen-avoider were able to solve the problems.

I renamed the extension because the old name didn't describe the new behaviour well, but it still owes its existence to @Noobsai. I should probably add a hidden setting so that it remembers where you moved it to and restores that setting when you reload GNOME.