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---
stage: Manage
group: Authentication and Authorization
info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#assignments
---
# Modify global user settings **(FREE SELF)**
GitLab administrators can modify user settings for the entire GitLab instance.
## Prevent new users from creating top-level groups
By default, new users can create top-level groups. To disable new users'
ability to create top-level groups (does not affect existing users' setting):
**Omnibus GitLab installations**
1. Edit `/etc/gitlab/gitlab.rb` and add the following line:
```ruby
gitlab_rails['gitlab_default_can_create_group'] = false
```
1. [Reconfigure and restart GitLab](restart_gitlab.md#omnibus-installations).
**Source installations**
1. Edit `config/gitlab.yml` and uncomment the following line:
```yaml
# default_can_create_group: false # default: true
```
1. [Restart GitLab](restart_gitlab.md#installations-from-source).
### Prevent existing users from creating top-level groups
Administrators can:
- Use the Admin Area to [prevent an existing user from creating top-level groups](../user/admin_area/index.md#prevent-a-user-from-creating-groups).
- Use the [modify an existing user API endpoint](../api/users.md#user-modification) to change the `can_create_group` setting.
## Prevent users from changing their usernames
By default, new users can change their usernames. To disable your users'
ability to change their usernames:
**Omnibus GitLab installations**
1. Edit `/etc/gitlab/gitlab.rb` and add the following line:
```ruby
gitlab_rails['gitlab_username_changing_enabled'] = false
```
1. [Reconfigure and restart GitLab](restart_gitlab.md#omnibus-installations).
**Source installations**
1. Edit `config/gitlab.yml` and uncomment the following line:
```yaml
# username_changing_enabled: false # default: true - User can change their username/namespace
```
1. [Restart GitLab](restart_gitlab.md#installations-from-source).
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