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Ah, your last para sheds a bit more light on the issue :-) Draft View is designed to maximize performance, so by design it is restricted in a number of ways, one of which is the UI. It's expected behavior for the Sidebar to close when the Footnotes/Endnotes Pane opens & vice-versa.
What you might consider is assigning a custom keystroke to each of them. You can then continue use Draft View -- highly commendable, btw -- but just 'toggle' between display of the two panels rather than the 2 step approach of closing one then opening the other. I.e., I use:
Control+Option+D toggles the Document Map
Control+Option+E toggles the Endnote Pane
Unfortunately, that doesn't help with the width of the Document Map. However, if you go to a bit more trouble to create a macro you could include adjustment to the preferred width.
NOTE: When in Draft View, regardless of which method you use {keystrokes, menus, toolbar buttons) do not switch directly from viewing the Endnotes Area to any of the Sidebar choices while the insertion point [cursor] is still in the Endnotes Area. I believe there is a bug which I can reproduce consistently here but have not confirmed elsewhere. If the insertion point is in the Endnotes Area Word will crash. Oddly, it doesn't happen if you switch to Document Map while in the Footnotes Area... go figure :-) I believe a macro could help work around this but haven't taken the time to experiment with it.
Toolbar customizations (by default) are stored in the Normal.dotm template, as are custom keystroke assignments. They can also be stored in other template files if you so designate & can be copied from one template/document to another by using the Organizer.
Regards,
Bob J.