Keyboard shortcut: CTRL + ALT + M
This operator is responsible for mirroring the BlockSurface object. The object generated with the Geometry Nodes modifier will be mirrored on the corresponding axis (X, Y, or Z) to the button that is pressed.
Steps to follow:
Select an object in the collections that correspond to the BlockSurface you want to mirror.
Press the "Mirror Mesh" button to mirror the BlockSurface object. The axis will be X, Y, or Z depending on the button that is pressed.
An interesting option for the BlockSurface mirror is to set the target as the parent object of the branch. This will allow you to move the parent object and the BlockSurface mirror will maintain the correct position.