If I accidentally delete a landscape, how do I restore it

Development World Creation
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1

When I delete some meshes above the landscape，I always click on the landscape and sometimes I delete it.
I don’t know how to restore it , so I have to create the landscape again
Is there any ways to solve this porblem ? Such us Lock the layer or other way to restore it

2

Ctrl-Z? …

3

CtrlZ can restore mesh or actor ,but it didn’t work on the landscape

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