In Odoo, you cannot directly use user.company_id.id in the domain of ir.actions.act_window because XML does not have access to the user object

XML

<record id="your_action_id" model="ir.actions.act_window">
    <field name="name">Your Records</field>
    <field name="res_model">your.model</field>
    <field name="view_mode">tree,form</field>
    <field name="context">{'default_company_id': user.company_id.id}</field>
</record>

PY

from odoo import models, api

class YourModel(models.Model):
    _name = 'your.model'

    @api.model
    def default_get(self, fields):
        res = super().default_get(fields)
        res['company_id'] = self.env.user.company_id.id
        return res

Hi,

Please refer to the code below:

Python

from odoo import models, fields, api

class YourModel(models.Model):

    _name = 'your.model' 

    _description = 'Your Model'

    user_company_id = fields.Many2one(

        'res.company',

        string="User's Company",

        compute='_compute_user_company_id',

        store=False

    )

    @api.depends_context('uid')

    def _compute_user_company_id(self):

        for rec in self:

            rec.user_company_id = self.env.company.id

XML:

<record id="action_your_model" model="ir.actions.act_window">

    <field name="name">Your Model</field>

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

    <field name="view_mode">tree,form</field>

    <field name="domain">[('company_id', '=', user_company_id)]</field>

</record>

Hope it helps.