Currently, OutSystems UI provides built-in Open and Close actions for individual Tooltip components. However, if we review the Tooltip API implementation, we can see that there is also a GetAllTooltips method available.

https://github.com/OutSystems/outsystems-ui/blob/53a8f0e/src/scripts/OutSystems/OSUI/Patterns/TooltipAPI.ts#L2

If you want to show all the tooltips in the screen you need to rely on a iteration and trigger the open tooltip action.  Add the GetAllTooltips and ShowAllTooltips to the list of OutsystemsUI Actions.