Or another way to do it in the scene browser without altering visibility - go to the Scene Browser > Types section and do a Ctrl+left click on the selection dot for Types > Surfaces.
That turns on a selection filter for individual surfaces.
Now you can go click on the selection dot for Types > Edges and all edges of only individual surfaces (because of the filter) will be selected and you can now hit Delete to untrim, then hit the Esc key to clear the selection filter.
- Michael
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