I cannot get out of the function I was working in? Where’s the exit or close buttons?

If you are working on a plan you will need to click the Close button on the top right side of the toolbar.

If you are working in Views the Close button is on the top right side of the toolbar

If you are creating a Domain the Close Button is in the lower left corner. If you are editing an existing Domain the Cancel button is in the lower right corner.

If you are working on Filters the Cancel Button is in the lower right corner.