Z-Ordering of drop down menu and Viz menu is incorrect

[AdRiley]

The drop down menu should display above the viz menu.

The Column separators should render below the drop down menu

[enso-bot[bot]]

Keziah Wesley reports a new STANDUP for today (2024-05-02):

Progress: Implemented z-order changes, started on documentation editor. It should be finished by 2024-05-02.

Next Day: Next day I will be working on the #9786 task. Continue working on documentation editor.

[kazcw]

The solution in #9848 conflicts with #9842 until #9830 is implemented. Reverting it until then; details in #9830.