Force.com IDE Developer Guide

Get Started with the Force.com IDE
Develop with the Force.com IDE
Test Code with the Force.com IDE
Deploy Code with the Force.com IDE
Get Started with the Apex Debugger
Get Started with the Apex Debugger
Set Up the Apex Debugger
Explore a Simple Debugging Puzzle
Manage Debugging Sessions
Apex Debugger Limits and Considerations
Apex Debugger Troubleshooting
Get Started with the ISV Customer Debugger
Force.com IDE Release Notes
Useful References
PDF

Manage Debugging Sessions

Any of your org’s sandboxes can use the Apex Debugger sessions related to your parent org. Track and manage your sandbox orgs’ sessions, and subscriber sessions for the ISV Customer Debugger, in Setup.
Available in: both Salesforce Classic and Lightning Experience
Available in: Enterprise, Performance (one session included), and Unlimited (one session included) Editions

User Permissions Needed
To manage Apex Debugger sessions from Setup: In your production org: Debug Apex AND auto-enabled dependent permissions

OR

In your LMO: Modify All Data AND View and Debug Managed Apex
  1. From Setup, enter Apex Debugger in the Quick Find box, then select Apex Debugger.
    Manage sessions on the Apex Debugger page in Setup
  2. If desired, contact the debugging user whose license you plan to revoke.
  3. To end the debugging session that you want to terminate, select Revoke License.
    The debugging session ends, and a license is freed up. The next user who initiates a debugging session consumes the available license. The user whose session you terminated isn’t prevented from starting future sessions.