The ClassicMenu Indicator works in the Notification Area only. But that contains also other notifiers (network, BT) which I prefer to stay at the right of the panel.
If I put the CMI in an own Launcher its icon is shown there but no menu is shown at selecting but a new instance of CMI is created in the Notification Area every time.
Is there an option (cmd line or in the .desktop or wherever) to use CMI from a Launcher, such being able to place it at the panel's left side?
Got it:
$ classicmenu-indicator --help
Usage: classicmenu-indicator [options]
Options:
--version show program's version number and exit
-h, --help show this help message and exit
-m, --show-menu Show menu at mouse pointer location. This requires an
already running instance of ClassicMenu Indicator
-i, --ignore-running Start a new instance of ClassicMenu Indicator, even if
there alread is onerunning
So:
Right-Click panel → Panel → Panel Preferences... → Items → Launcher → 
(edit) → General → ClassicMenu Indicator → 
(edit) → Command: classicmenu-indicator -m
in addition to the Classicmenu-indicator in the Notification Area, which then can be set to ☑ Hidden there.
xfce-panelas a tag. Please edit your question to also mention the distribution in use and its version. It maybe relevant. Also, your link indicates that CMI was last updated in 2017. – DK Bose Jan 7 at 2:18