In the Stacks editor, the popover on top becomes invisible when hovering over the tools icon, significantly when the editor menu block extends to the end of the page.
Popover behavior changes before and after the menu reaches the end of the page:
|Operating System||Windows 11 Pro|
|Mozilla Firefox||117.0.1 (64-bit)|
|Google Chrome||117.0.5938.89 (Official Build) (64-bit)|