How do I extend a wall if the entire room is grouped?

I created a group (or tag or layer) of all my outside walls. But now how do I extend a single wall despite this grouping? When I try to highlight the ends, it selects the whole group.?

Thank you

Open the group for editing. Double click on it with the Select tool or right click on it and choose Edit Group.

Ah, OK, I’ll give that a try. Thanks