This shortcut doesn't work, even when the TB is showing
This works even when the TB is hidden
What is this checkbox for - I can see if EBD is shown.

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When I discovered the EnvVar that gets rid of icons on menu's I set it immediately:
CALIBRE_NO_ICONS_IN_MENUS=True.
Sometimes, the EBD button gets hidden behind the TB Find box
More to come
BR