I found this guide https://itsfoss.com/ubuntu-mate-customization/ where, regarding to this doubt I have, it says “Right click on any applet on the panel. You will see a popup menu. You can move any applet on the panel or remove them from there. Some of the applets also have additional options — like Edit, Preferences etc. After you are finished with the adjustments, you might also want to lock them to the panel.”
But in the new version of mate (1.20.1) I can’t find the way to Edit or change the preferences so that I can, for example, remove some of the elements (sound, network, session or any other) which are part of the indicator mate applet.
Thank you in advance