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Please note that both elements were a "div" element before version 21.16. With version 21.16 and the versions afterwards  both elements were changed to a "button" element.

Before the version 21.16 and hide please see the following configuration for hiding mouse and SignOnPhone

div[title='Mouse'] {
    visibility: hidden;
}

div[title='SignOnPhone'] {
    visibility: hidden;
}

With 21.16 and the versions afterwards and hide see the following configuration for hiding mouse and SignOnPhone

button[data-id='SignOnPhone'] {
    visibility: hidden;
}

button[data-id='Mouse'] {
    visibility: hidden;
}

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