Change of zones in the page

[andesys]

When you are changing the zones the system will not allow you to delete a zone in which webparts are present. If you want to delete a zone than you have to move the webparts into another zone and then change the page design.
Therefore, you cannot lose your existing webparts.

[andesys]

When changing zones the system will not allow you to delete a zone that contains webparts. If you want to delete a zone, then move the webparts first into another zone and then change the page design.
Therefore, you cannot lose existing webparts when doing changes in the page design.