Hi,

By default, Odoo’s Graph View provides options to switch between Bar, Line, and Pie charts, along with a Stacked toggle.

To restrict the view to only Bar charts and hide the other options (Pie, Line, and Stacked), you can use specific attributes in the <graph> tag within your XML view definition.

xml -

<record id="your_graph_view_id" model="ir.ui.view">

    <field name="name">your.model.graph.view</field>

    <field name="model">your.model</field>

    <field name="arch" type="xml">

        <graph string="Your Graph" type="bar"

               disable_pie="1"

               disable_line="1"

               disable_stacked_bar="1">

            <field name="your_group_by_field" type="row"/>

            <field name="your_measure_field" type="measure"/>

        </graph>

    </field>

</record>

Explanation of Attributes-

type="bar": -Sets the default chart type to Bar.

disable_pie="1": Hides the Pie chart option from the toolbar.

disable_line="1": Hides the Line chart option.

disable_stacked_bar="1": Hides the Stacked toggle button.

Hope it helps

try this one