I'm looking for a log file viewer that can handle simultaneously viewing multiple arbitrarily wide log files. This is like 'less -S' or toggle-truncate-lines in emacs, where it *does not* do this ...

The Operational event logs (you have to dig down further in the Event Viewer to see these) contain a lot of the detail that the old USERENV.LOG file would provide.

Learn how to view, delete or clear the Event Log files in Windows 11/10 via the Event Viewer UI or the wevtutil Command line tool. Delete all or selected Event log files.

Also Read: How to clear the Event Log in Windows Where are the Event Viewer logs stored in Windows 11? Windows stores its Event Viewer’s logs in C:\WINDOWS\system32\config\. You can open File ...

If you really want to see what's happening beneath the hood of your Linux distribution, you need to use log files.