If you have a dashboard with multiple objects you want to make sure get the same allocated space, make sure you add them to the same (horizontal/virtual) container.

Then select the container (either from the Layout pane on the left hand side or by double clicking on the handle bar on one of the sheet – to make sure the container is selected)

Go to the menu (small triangle on the top corner) and select “Distribute Contents Evenly”.

Adding additional objects or removing objects will automatically redistribute the objects as well.