My org doesn`t have Territory Settings in setup. What is reason? Profile - System administrator, Organization Edition - Enterprise Edition
Territory management is not enabled by default in Salesforce. To request territory management for your organization, contact salesforce.com. If you have already done this step and you are seeing this feature missing recently. The following might be the cause
Migrating to the new Collaborative Forecasting requires disabling Territory Management 1.0
As per this documentation, the Customizable Forecasting was retired for all customers as of Summer ’20. Users can’t access the Customizable Forecasting feature and its underlying data. Salesforce encourages you to migrate to Collaborative Forecasts. The documentation also quotes "If you agree to the steps above, please contact support to enable permission to allow you to deactivate Customizable Forecasting and/or Territory Management 1.0"
I recommend engaging support if you have any specific questions
The territory management feature is scheduled for retirement for all customers as of Summer ’21. After the feature is retired, users can’t access the original territory management feature and its underlying data. We encourage you to migrate to Enterprise Territory Management.
I hope it helps.