I am new to Manjaro. Shortcut key like ctrl+alt+d (minimize all windows) and crtl+alt+left or right (switch workspaces) worked before. This has happened few times and every time I reset configurations. I use a stable kernel, which is Linux 54 but still get these issues. Does anyone know why this happens?
Welcome to the forum! 
I am not a developer, and so I’m not certain yet, but there does appear to be a problem with keyboard settings and shortcuts that spans different desktop environments, as you can read in this thread below… 
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or also
install wmctrl
create shortcut in keyboard shortcuts:
command:
wmctrl -k on
keys control+alt+d
or also
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Thank you! I hope the problem will be solve next update:)
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