You can set the following
preferences in the Undo category of the Preferences window.
Undo
- Undo
-
Select On if you want to be able to undo operations.
This is the default.
- Queue
-
Select
Infinite to perform an unlimited number of undo operations. This
option can use a lot of memory. Select Finite to limit the number
of undo operations you can perform (specified in the Queue
Size box). The default is Finite.
- Queue size
-
If Finite is the selected Queue setting,
specify here the number of undo operations you can perform. The
default is 50.