Hi,

I have prepared a forked stackblitz example for a navigator selection with a shared tooltip:

https://stackblitz.com/edit/angular-h1j1hq-kmmqfg?file=src%2Fapp%2Fapp.component.ts

(I also included a screenshot)
There seems to be now way to have a shared tooltip in this scenario that makes sense, clearly no one needs the duplicated items in the tooltip that origins from the navigator selection pane.

So I would propose a flag for a pane to configure if a pane is included in the shared tooltip.

Or alternatively on the series item level a flag that allows for enable / disable or visible / invisible regarding the shared tool tip.

I think there are other cases where this might come handy to have a shared tooltip for several serieses only over one pane, or exclude specific panes and or serieses.

I tried to make the tooltip invisible, on the series level of the navigator pane but something like:

[tooltip]="{ visible: false }"

inside the navigator series seems to be only applicable to the current series tooltips but not the shared ones.