In Kintone Administration, you can configure user permission settings, feature customization, and other settings related to managing and maintaining Kintone. Note that you need to be either a Kintone users & system Administrator or a Kintone Administrator to configure settings in Kintone Administration.
Reference: Types of Administrators and Permissions

To open the "Kintone Administration" screen, click the Settings icon (the gear-shaped icon) at the top of Kintone, then click ​​Kintone Administration.

The following is a list of what you can do in Kintone Administration. For more information, refer to the respective pages.

• Managing apps
• Managing app templates
• Registering guidelines for app settings
• Managing spaces
• Managing space templates
• Opening the "Thread action management" screen
• Managing guests
• Permissions Configured in Kintone Administration
• Managing app groups
• Customizing Kintone system-wide using JavaScript and CSS
• Changing the header color

• Enabling Kintone AI and selecting features to use

• Update options
• Settings to activate email notifications
• Feature activation
• Managing plug-ins
• Configuring the default view for mobile browsers
• Restoring Deleted Apps (Only for Kintone users & system Administrators)
• Restoring Deleted Spaces (Only for Kintone users & system Administrators)
• Monitoring User Access (Only for Kintone users & system Administrators)

• Shared app settings

Settings related to users, departments, and security are configured in Users & system administration. For more information on the settings configurable in Users & system administration, refer to: 
Kintone Help