If I try to use the Divider, I get new AStar Navigator. So, the divider doesn't work properly.
It seems like I have 3 Navigator which seems not right. Is there a way to fix this without starting from the beginning?
The original A* navigator probably ended up as a subnode of a different object somehow.When adding a divider (or other A* object) FlexSim only checks if one is present on the model 'layer'. If not, it creates a new one.
So please first make sure that the A* navigator is present as a direct subnode of the "model" object. Then no new navigator should be added when you drag a divider into the model.
The presence of a "DefaultNavigator" is normal. It will be added automatically when you drag a task executer into the model. It would be used if you do not connect the TE to any other network (network nodes, A*, AGV).
@Felix Möhlmann Thank you for your answer. In my model, my AStarNavigator is under "model" object(same level as Tools). But it still creates a new one. 
The name apparently also must not be changed. I removed the "_1f_" and the toolbox entry reappeared and no new navigator was created when dragging a barrier or divider into the model.
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