I noticed the same!! In the shortcut menu 'Explode' is only available if you have already grouped an object! Maybe a bug.
In german it is called "In Einzelteile auflösen" and the possible bug is not in the contextmenu but in the preferences:
- If no group or component is selected, the entry is not there (see picture)
- If a group is selected, you can find the entry in the shortcut list