models/res_config_settings.py
from odoo import api, fields, models
class ResConfigSettings(models.TransientModel):
_inherit = 'res.config.settings'
sample = fields.Char(string='Sample', config_parameter='module_name.sample')
views/res_config_settings.xml
<odoo>
<data>
<record id="res_config_settings_view_form" model="ir.ui.view">
<field name="name">res.config.settings.module_name</field>
<field name="model">res.config.settings</field>
<field name="inherit_id" ref="base.res_config_settings_view_form" />
<field name="arch" type="xml">
<xpath expr="//div[hasclass('settings')]" position="inside">
<div class="app_settings_block" data-string="Module Name"
string="Module Name" data-key="module_name">
<div id="module_name">
<h2>Module Name Sample Settings</h2>
<div class="row o_settings_container">
<div class="col-12 col-lg-12 o_setting_box">
<div class="o_setting_right_pane">
<label for="sample" string="Sample Setting"
class="o_light_label me-4" />
<field name="sample" class="oe_inline" />
</div>
</div>
</div>
</div>
</div>
</xpath>
</field>
</record>
</data>
</odoo>