I may have a hint for your default view problem. I'll try to explain the best I can. When I put the little separation bar (the one at the right of the tree view), there's a little space left that I can't hide. It seems to be te same size of the word "dossier", folder in english. Maybe the name size has something to do with that minimum view size. Here's a screen shot to better explain what my limited language can't:

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