@ufkhf welcome to the forum.

The date / time displayed is not a clock but when the note being viewed was last modified.

Anyway, I believe that entering the below in userchrome.css will remove all the buttons on the right of the note title. Quit and restart Joplin to apply the changes.

If you change your mind for one or more of them just delete the entries for those you want to re-enable.

span.updated-time-label,
a[title="Spell checker"],
a[title="Set alarm"],
a[title="Toggle editor layout"],
a[title="Note properties"] {
    display: none;
}

before
Before

after
After

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