I've looked everywhere but obviously not the right places.
In Designer Pro MDI there are the tabs for the multiple documents open. At the right end of the tab area are two arrows, one left & one right, beside the close tool. As they are on the tab area I thought they would activate the prev/next tab as tho you had used CTRL TAB combo.

Can someone tell me what these two arrows do please as they do not have tooltips & I cannot find them in the Help?
td