Problems to eliminate sources

I use vero 4k + connected to an Android sony tv to watch movies and series that I have on a Synology NAS that connects to vero4k + via lan cable and NFS connection.
Before the last update 17 kodi, I could eliminate the sources when connecting a mouse on the usb, but with the last update kodi 18, when I connect the mouse, it does not work.
From the command of the TV and control of the Vero 4k + I have no option to eliminate, I could only from a mouse and in the version kodi 17.
Please, how do I eliminate the sources?
And what is the best way to add sources?

Thank you very much and greetings

When you are on the Source open context menu (three lines/dots) on the Vero Remote and choose Remove Source

In eg Videos - Files choose Add Videos

Is it enabled under Settings - System - Input?

solved, thank you very much