library/library_checkout/views/checkout_view.xml

<?xml version="1.0" ?>
<odoo>
    <record id="view_tree_checkout" model="ir.ui.view">
        <field name="name">Checkout Tree</field>
        <field name="model">library.checkout</field>
        <field name="arch" type="xml">
            <tree
                decoration-muted="state in ['done', 'cancel']"
                decoration-bf="state=='open'">
                <field name="state" invisible="True" />
                <field name="request_date" />
                <field name="member_id" />
                <field name="checkout_date" />
                <field name="stage_id" />
                <field name="num_books" sum="# Books" />
            </tree>
        </field>
    </record>

    <record id="view_filter_checkout" model="ir.ui.view">
        <field name="model">library.checkout</field>
        <field name="arch" type="xml">
            <search>
                <field name="member_id" />
                <field name="user_id" />
                <filter name="filter_not_done"
                    string="To Return"
                    domain="[('state','=','open')]" />
                <filter name="filter_my_checkouts"
                    string="My Checkouts"
                    domain="[('user_id', '=', uid)]" />
                <filter name="group_user"
                    string="By Member"
                    context="{'group_by': 'member_id'}" />
            </search>
        </field>
    </record>
    
    <record id="view_calendar_checkout" model="ir.ui.view">
        <field name="model">library.checkout</field>
        <field name="arch" type="xml">
            <calendar date_start="request_date"
                color="user_id">
                <field name="member_id" />
                <field name="stage_id" />
            </calendar>
        </field>
    </record>

    <record id="view_pivot_checkout" model="ir.ui.view">
        <field name="model">library.checkout</field>
        <field name="arch" type="xml">
            <pivot>
                <field name="stage_id" type="col" />
                <field name="member_id" />
                <field name="request_date" interval="week" />
                <field name="num_books" type="measure" />
            </pivot>
        </field>
    </record>

    <record id="view_graph_checkout" model="ir.ui.view">
        <field name="model">library.checkout</field>
        <field name="arch" type="xml">
            <graph type="bar">
                <field name="stage_id" />
                <field name="num_books" type="measure" />
            </graph>
        </field>
    </record>

    <act_window id="action_other_checkouts_button"
        name="Open Other Checkouts"
        res_model="library.checkout"
        view_mode="tree,form"
        domain="[('member_id', '=', default_member_id),
            ('state', 'in', ['open']),
            ('id', '!=', active_id)]"/>

    <record id="view_form_checkout" model="ir.ui.view">
        <field name="name">Checkout Form</field>
        <field name="model">library.checkout</field>
        <field name="arch" type="xml">

            <form>
                <sheet>
                        
                    <group>
                        <field name="kanban_state" widget="state_selection" />
                        <field name="priority" widget="priority" />  
                        <field name="member_id" />
                        <field name="request_date" />
                        <field name="user_id" />
                        <field name="line_ids" />
                        <field name="color" />
                        <field name="stage_id" />
                    </group>
                    <group>
                        <field name="checkout_date" />
                        <field name="closed_date" />

                    </group>


                </sheet>
                <div class="oe_chatter">
                    <field name="message_follower_ids" widget="mail_followers" />
                    <field name="activity_ids" widget="mail_activity" />
                    <field name="message_ids" widget="mail_thread" />
                </div>

                <header>
                    <field name="state" invisible="True" />
                        <button name="button_done" 
                            type="object" 
                            string="Returned" 
                            states="open,cancel" 
                            class="oe_highlight" />

                    <field name="stage_id"
                        widget="statusbar"
                        clickable="True"
                        options="{'fold_field': 'fold'}" />

                    <field name="state"
                        widget="statusbar"
                        clickable="True"
                        statusbar_visible="draft,open,done" />
                </header>

                <sheet>
                    <field name="member_image" widget="image" class="oe_avatar" />
                    <div class="oe_title">
                        <label for="member_id" class="oe_edit_only" />
                        <h1><field name="member_id" /></h1>
                        <h3>
                            <span class="oe_read_only">By </span>
                            <label for="user_id" class="oe_edit_only" />
                            <field name="user_id" class="oe_inline" />
                        </h3>
                    </div>
                    <!-- More elements will be added from here... -->
                    <group name="group_top">
                        <group name="group_col1">
                            <field name="user_id" />
                            <field name="checkout_date" />
                        </group>
                        <group name="group_col2">
                            <field name="state" />
                            <field name="closed_date" />
                        </group>
                    </group>
                </sheet>

                    <notebook>
                        <page string="Borrowed Books" name="page_lines">
                            <field name="line_ids">
                                <tree>
                                    <field name="book_id" />
                                </tree>
                                <!--form>
                                    <field name="book_id" />
                                </form-->
                            </field>
                        </page>
                    </notebook>

                <div name="button_box" class="oe_button_box">
                        <button class="oe_stat_button"
                            icon="fa-tasks"
                            help="Other checkouts pending return."
                            type="action"
                            name="%(action_other_checkouts_button)d"
                            context="{'default_member_id': member_id}">
                            <field string="To Return"
                                name="num_other_checkouts"
                                widget="statinfo" />
                        </button>
                </div>

            </form>
        </field>
    </record>
</odoo>