It’s important to use the right terminology here.
On a Mac, “palettes” are the toolbars created by individual Tools or for some built-in palettes from multiple built-in Tools. You open or close these via the View->Palettes menu item (and can also close them by clicking the red button in their top stripe). They cannot be resized and have no collapsed state on the screen; they are either completely open or completely gone. They float independently on the screen, perfectly happy to overlap each other.
Inspector windows are the things equivalent to what you find in the default Tray on Windows. You can open or close them via the Window menu. You can also close them by clicking the button in their top stripe. In addition, you can collapse or expand them by clicking their top stripe. Unlike palettes, they remain visible as a single bar when collapsed.
On Mac the inspector windows are individual dialogs that happen to stick to each other when brought together vertically and if their widths are compatible. Unless stuck together, they are happy to float atop each other. There are some idiosyncratic aspects of “compatible”. For example, if a narrower inspector is brought against the bottom of another, it will snap to it and adjust to match width. But if a wider one is brought up the same way, the one above won’t adjust and they won’t snap together.
Once snapped together:
- They can be moved about the screen as if a single unit.
- They will snap en-mass to an edge of the screen.
- Clicking the name bar to expand or collapse an inspector shoves the others out of the way or pulls them back up.
- When open, each has its own little triangular resize handle at the lower right corner, which also shoves others out of the way or pulls them up. On some inspectors, e.g. Entity Info, the resize handles don’t work.
- Dragging the top stripe will pull an inspector out of the “stack” along with any others attached to its bottom edge.
There is no way to make them into a single combined object analogous to a Windows tray. If you open too many so that some get pushed off the bottom of the screen, there is no way to scroll the assembly. You must close some or detach them by moving them away from the stack.