How to go back to a special step after overusing UNDO in ZWCAD?

Issue:

UNDO is useful to cancel the mistake and go back to the right state, we can use Ctrl+Z or command UNDO to make it work. But sometimes you might overuse it and want to go back to a special step, how?

Solution:

Input command MREDO and then input the step that you want to restore. This command is used to reverse the effects of several previous UNDO or U commands. Besides, you can also use Ctrl+Y to go back step by step.

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