Hello Ashutosh

there is a method called "session_info" in HTTP model and web/models/ir_http.py file.

this method pass "home_action_id" : user.action_id.id to front env via javascript.

class Http(models.AbstractModel):
    _inherit = 'ir.http'

    def session_info(self):
        user = request.env.user
        version_info = odoo.service.common.exp_version()

        session_uid = request.session.uid
        user_context = request.session.get_context() if session_uid else {}
        IrConfigSudo = self.env['ir.config_parameter'].sudo()
        max_file_upload_size = int(IrConfigSudo.get_param(
            'web.max_file_upload_size',
            default=128 * 1024 * 1024,  # 128MiB
        ))
        mods = odoo.conf.server_wide_modules or []
        lang = user_context.get("lang")
        translation_hash = request.env['ir.translation'].sudo().get_web_translations_hash(mods, lang)
        session_info = {
            "uid": session_uid,
            "is_system": user._is_system() if session_uid else False,
            "is_admin": user._is_admin() if session_uid else False,
            "user_context": user_context,
            "db": request.session.db,
            "server_version": version_info.get('server_version'),
            "server_version_info": version_info.get('server_version_info'),
            "support_url": "https://www.odoo.com/buy",
            "name": user.name,
            "username": user.login,
            "partner_display_name": user.partner_id.display_name,
            "company_id": user.company_id.id if session_uid else None,  # YTI TODO: Remove this from the user context
            "partner_id": user.partner_id.id if session_uid and user.partner_id else None,
            "web.base.url": IrConfigSudo.get_param('web.base.url', default=''),
            "active_ids_limit": int(IrConfigSudo.get_param('web.active_ids_limit', default='20000')),
            'profile_session': request.session.profile_session,
            'profile_collectors': request.session.profile_collectors,
            'profile_params': request.session.profile_params,
            "max_file_upload_size": max_file_upload_size,
            "home_action_id": user.action_id.id,
            "cache_hashes": {
                "translations": translation_hash,
            },
            "currencies": self.sudo().get_currencies(),
        }

Thanks & Regards,

​

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go to your users preferences>>home action 
and u ca n select any action to start with