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User does not have the option to display the Model Tree in the "Navigation Tabs". How do I get that option back?
Usualy the model tree is displayed when a model is open.
Then you can switch to Layer Tree instead and back to Model tree from the Show > Model Tree.
Then one layer higher there are the tabs for Tree, Folder Browser and Favorites.
And finally in the lower left corner you can switch Navigator on/off.
Is any of the buttons inaccessible or did it disappear?
I would check these two things.
1) in options>window settings> heading "model tree settings"
is "display as separate window" checked or unchecked?
(should be unchecked)
2) in the config.pro options enable_tree_indep yes/no
(should be no)
if both of these are set correctly and you are still not seeing the tree, go to view>show>model tree