Add a new button in top of the list view in Odoo when clicked it will call a method in your model

list_view_button.js

odoo.define('your_module.new_button', function (require) {
  "use strict";
  /**
   * Button 'Create' is replaced by Custom Button 
  **/

  var core = require('web.core');
  var ListController = require('web.ListController');
  ListController.include({
     renderButtons: function($node) {
     this._super.apply(this, arguments);
         if (this.$buttons) {
           this.$buttons.find('.oe_your_model_button').click(this.proxy('action_your_method'));
         }
      },

      //--------------------------------------------------------------------------
      // Define Handler for new Custom Button
      //--------------------------------------------------------------------------

      /**
       * @private
       * @param {MouseEvent} event
       */
      action_your_method: function (e) {
          var self = this;
          var active_id = this.model.get(this.handle).getContext()['active_ids'];
          var model_name = this.model.get(this.handle).getContext()['active_model'];

          var searchQuery = this._controlPanel ? this._controlPanel.getSearchQuery() : {};
          var record = self.model.get(self.handle, {raw: true});
          var domain = record.getDomain();
          this._rpc({
              model: 'your_model',
              method: 'your_method',
              args: ["", model_name, active_id, domain, searchQuery],
          }).then(function (result) {
              self.do_action(result);
          });
     },

  });
  
});

list_view_button.xml

<?xml version="1.0" encoding="UTF-8"?>
<template xml:space="preserve">
  <t t-extend="ListView.buttons">
    <t t-jquery="button.o_list_export_xlsx" t-operation="before">
      <button t-if="widget.modelName == 'your_model'" class="btn btn-primary oe_action_button oe_your_model_button" type="button" accesskey="f">Your Button</button>
    </t>
  </t>
</template>

models.py

from odoo import models, fields, api

class YourModel(models.Model):
	_name = "your_model"
	
	partner_id = fields.Many2one("res.partner")
	
	def your_method(self, model_name, active_id, domain, searchQ):

		recs = self.env["your_model"].search(domain)