ie. I have several root menus such as
new tree (TREE0_ITEMS, TREE_TPL);
new tree (TREE1_ITEMS, TREE_TPL);
new tree (TREE2_ITEMS, TREE_TPL);
which would be nice to have an expand/collapse at the root level to collapse the whole menu as space is limited.
I know currently the only solution is to incorporate all of them into a single menu with a dummy root and the rest start at the 2nd node level.
The feature requires code changing, PRO version has the feature implemented.