In the tool bar below the main menu click on 
Undo or on 
Redo. Both functions are also available in the main menu under Edit. This way you can undo or redo up to 100 steps if necessary.
Needless to say that Wings Vioso RX also features an Undo/Redo Function to undo or redo virtually any editing step. For this purpose, Wings Vioso RX automatically saves every editing step up to a total of 99.
In the tool bar below the main menu click on Undo or on Redo. Both functions are also available in the main menu under Edit. This way you can undo or redo up to 100 steps if necessary.
There are certain situations when automatic saving of undo steps tends to take irritatingly long. In such cases you can switch off automatic saving of undo steps and save the steps manually.
In the toolbar, click on 
Save undo step and a message will appear warning you that automatic saving will be disabled.
When you click OK automatic saving of undo steps is disabled you need to save the individual undo steps manually by clicking Save undo step or by pressing Alt + S.
If you want to change back to automatic saving of undo steps you can click Edit in the main menu followed by Automatic Undo.
You should only disable automatic saving of undo steps if you have important reasons to do so. Please bear in mind that with the automatic saving feature being disabled, you can only return to those editing steps that you have previously saved manually as undo steps!