You can't.
A bug in the current version 0.43.1 makes it impossible to activate it (at least for people who have advanced sufficiently in the game - i.e. fence repairing done).
Attached a quick and dirty fix for this. Talk to the GG girl for the new option. Caution: this scene is not repeatable.
View attachment 2392692
Download, decompress and replace the "Map009.json" file in the "www\data" sub-folder of the game.
Do backup the original file first. And make and keep in a safe place a save (for the future) before replacing the "Map009.json" file and playing the new scene.
*** Edit *** "Better" patch version.