.o_form_view:not(.o_field_highlight) {
    .o_field_many2one_selection {
        .o_external_button, .o_dropdown_button {
            visibility: hidden;
        }

        &:hover, &:focus-within {
            .o_external_button, .o_dropdown_button {
                visibility: visible;
            }
        }
    }
}