Hide dimensions definition as default in Cube Viewer

[Lingo Wang]

Anyone know how to hide "Dimensions Definition Section" from the Cube Viewer as default (e.g. first-time open the view)? so user only enable/open it when needed, just like the Hierarchy Definition Section we can use "hierarchiesVisible = false" to hide.

also, would be nice if we can control visibility of some of the buttons on toolbar, e.g.
a) Instance dropdown, hide/show
b) Cube dropdown, hide/show
c) ViewManagement section: view dropdown+reset+clear+save+saveas+delete, can show/hide as the whole section
d) MDX button, show/hide

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[Scott Wiltshire]

Removing milestone: 2020_Q4 (automated comment)