BBO Practice in V3 is just that - a section to open a bidding practice table, a teaching practice table or a Bridge Master practice table. The old version was the same. To open a "practice" table (be it bidding or teaching) in the IAC, in both versions you must start the table in the IAC.
The Host of a teaching table in V2 had the ability to undo but not the ability to claim. It seems to be the opposite in V3 - Host cannot undo but can claim.
To change the cards in a particular hand can be done through Hand Editor. Many times Wisskers (for whom I host numerous tables) has made a mistake in a hand or wants to demonstrate a different lay of the cards. I export the hand to Hand Editor, change whatever needs changed, then upload the corrected hand to the table. Wouldn't it be nice to actually be able to move the cards on the table.
I have had many problems with the teaching table feature (no undo for Host, no copy/paste, loss of Chat Manager lines, no "Save All Deals", Skype/Voice not working at the same time, unable to get voice on Safari, clumsy pull down menus and Hand Editor) which I have noted and sent to BBO with no reply received. But as I was told many years ago by a BBO rep, teaching tables are not priority. Now I am just happy that we have bidding, teaching and FREE Bridge Master so am finished complaining to them.
V3 is essentially a program for mobile use and not intended for my 21 inch desktop monitor. Since I don't even own a cell phone I guess I will just be content with what they offer.