I just downloaded Behavior Trees from the Unity Asset Store a few hours ago on Unity version 2018.3.0f2.
After playing around with it for a bit, I exited playmode and attempted to further edit my instance of a Behavior Tree.
See the following image for more details:
I restarted Unity and restarted my computer with no change. Once I open the tree again, it only shows that view only mode.
If I enter runtime, I can edit the tree again but once I leave runtime, it reverts to view only mode.
If I add a new instance of a Behavior Tree, I can edit that one without problem. However, I attempted to just start over given how early on I was and this same view only mode occurred on my new Behavior Tree as well.
After playing around with it for a bit, I exited playmode and attempted to further edit my instance of a Behavior Tree.
See the following image for more details:
I restarted Unity and restarted my computer with no change. Once I open the tree again, it only shows that view only mode.
If I enter runtime, I can edit the tree again but once I leave runtime, it reverts to view only mode.
If I add a new instance of a Behavior Tree, I can edit that one without problem. However, I attempted to just start over given how early on I was and this same view only mode occurred on my new Behavior Tree as well.