library/library_member/views/book_view.xml

<?xml version="1.0"?>
<odoo>
    <record id="view_form_book_extend" model="ir.ui.view">
        <field name="name">Book: add Is Available? field</field>
        <field name="model">library.book</field>
        <field name="inherit_id" ref="library_app.view_form_book" /> <!--继承library_app的view_form_book视图-->
        <field name="arch" type="xml">
            <field name="isbn" position="after"> <!--定位 在field isbn后面-->
                <field name="is_available" /> <!--添加is_available字段-->
            </field>
        </field>
    </record>
    <record id="view_tree_book_extend" model="ir.ui.view">
        <field name="name">Book: add Is Available? field</field>
        <field name="model">library.book</field>
        <field name="inherit_id" ref="library_app.view_tree_book" /> 
        <field name="arch" type="xml">
            <field name="author_ids" position="after"> 
                <field name="is_available" />
            </field>
        </field>
    </record>

</odoo>