Noticed recent system-wide change in menus that prevents me from discovering keyboard shortcuts. Is there a terminal command or app which undoes this?
Keyboard shortcuts are always shown in gray (matching the appearance of the dimmed commands not available for current app state). Notice gray commands in screenshot even for available menu items.
Unfortunately, there isn’t a fix for this problem, it’s a deliberate choice made by Apple. I have higher contrast and disabled transparency set on my system (iMac 2017 27-inch, latest Monterey, screen resolution bumped down to 2048 x 1152) but unless Apple relents from this decision that’s as good as it’ll get right now.
The free app Cheatsheet may be useful to you. It installs as a login item and causes a long press of the command key to display a list of the commands and shortcuts for the current foreground app.