Morning Guys. I have this module that has a kanban view and i would like to display all the stages nut fold the ones with no record in them. Here is my model

# -*- coding: utf-8 -*-
from datetime import datetime, timedelta
from itertools import groupby
import json

import PyPDF2
import re
import io
from odoo import api, Command, fields, models, tools, SUPERUSER_ID, _, _lt
from random import randint
from datetime import date, datetime, timedelta

import logging

_logger = logging.getLogger(__name__)



class TenderTracker(models.Model):
    _name = 'tender.initial'
    _description = 'Tender Initialization'
    _inherit = ['mail.thread', 'mail.activity.mixin', 'rating.mixin']

    name = fields.Char(string='Tender Title', required=True, tracking=True)
    validity_period = fields.Integer(string='Validity Period (Days)', tracking=True)
    submission_deadline = fields.Datetime(string='Submission Deadline', tracking=True)
    opening_date = fields.Datetime(string='Tender Opening Date', tracking=True)
    document_fee = fields.Float(string='Document Fee')
    bid_bond_required = fields.Boolean(string='Bid Bond Required')
    eligibility_criteria = fields.Text(string='Eligibility Criteria')
    document = fields.Binary(string='Document', tracking=True)
    user_name = fields.Many2one('tender.users')
    email = fields.Char(related='user_name.email')

    extracted_text = fields.Text(string='Extracted Text')
    progress = fields.Integer()
    progress_percentage = fields.Float(compute='_compute_progress_percentage')
    priority = fields.Selection([
        ('0', 'Normal'),
        ('1', 'Important'),
    ], default='0', index=True, string="Starred")
    color = fields.Text(string='Color Index')
    stage_id = fields.Many2one('tender.stage', string='Stage', trscking=True)
    tag_ids = fields.Many2one('tender.tags', string='Tags')
    kanban_state = fields.Selection([
        ('draft', 'Draft'),
        ('bidding', 'Bidding'),
        ('evaluation', 'Evaluation'),
        ('won', 'Won'),
        ('lost', 'Lost'),
        ('cancelled', 'Cancelled'),
        ('dropped', 'Dropped')],
        string='Status', copy=False, default='draft', group_expand='_expand_states', index=True, required=True)

    def _expand_states(self, states, domain, order):
        return [key for key, val in type(self).kanban_state.selection]

    @api.onchange('stage_id')
    def _onchange_stage_id(self):
        # Update kanban_state based on the selected stage
        if self.stage_id:
            # Your logic to map stages to kanban_state values
            if self.stage_id.name == 'Draft':
                self.kanban_state = 'draft'
            elif self.stage_id.name == 'Bidding':
                self.kanban_state = 'bidding'
            elif self.stage_id.name == 'Evaluation':
                self.kanban_state = 'evaluation'
            elif self.stage_id.name == 'Won':
                self.kanban_state = 'won'
            elif self.stage_id.name == 'Lost':
                self.kanban_state = 'lost'
            elif self.stage_id.name == 'Cancelled':
                self.kanban_state = 'cancelled'
            else:
                self.kanban_state = 'dropped'

    @api.onchange('document')
    def _onchange_document(self):
        _logger.info("Onchange Document method triggered")
        try:
            if self.document:
                # Extract text from the document
                extracted_text = self.extract_text_from_pdf()
                _logger.info("Text has been extracted")
                self.update({'extracted_text': extracted_text})
                _logger.info("Extracted text has been saved into the 'extracted_text' variable")

                # Update tender information based on extracted text
                self.update_tender_info_from_text(extracted_text)
                _logger.info("Tender information updated using the extracted text")

        except Exception as e:
            _logger.error(f"Error during onchange_document: {e}")


class TenderUsers(models.Model):
    # _inherit = "res.users"
    """ Tags of tender's users """
    _name = "tender.users"
    _description = "Tender Users"
    _inherit = ['mail.thread', 'mail.activity.mixin', 'rating.mixin']
    name = fields.Text(string='Name', required=True, tracking=True)
    email = fields.Char(string='Email', required=True, tracking=True)


class TenderStage(models.Model):
    _name = 'tender.stage'
    _description = 'Tender Stage'
    _inherit = ['mail.thread', 'mail.activity.mixin']
    # _fold_name = 'fold'

    name = fields.Char(string='Stage Name', required=True, tracking=True)
    sequence = fields.Float(string='Sequence', help="Gives the sequence order when displaying a list of tenders.")
    description = fields.Text(tracking=True)
    fold = fields.Boolean('Folded in Kanban', help="This stage is folded in the kanban view where there are no records in that stage to display.", default=True)

What do i need to change to achieve this? Thanks.