You can click on the headers in the table to change the sorting. Inactive filter was just displaying users who haven't logged in the past x months so you can change sorting to last online sorted by ascending and see inactive users.
How to disable the panel-resizer functionality?
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@limker I believe the default is fixed width, not full fluid 100% width, so by default all users should get the fixed width view.
If you want to force fixed width even on users who've toggled the fluid width option, you could add a bit of js to fix that up.