This question already has an answer here:
The menu for settings disappears when I click on another menu. How do I make it visual again?
When modeling trees with the Sapling add-on, if I click Undo the settings disappear for the Sapling add-on.
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marked as duplicate by Ray Mairlot, VRM, user2859, David♦, stacker Jan 23 '15 at 19:49
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
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This is standard behavior. You can not edit any settings after editing, moving, deselecting, etc. anything in the scene without the editing menu being removed.
