I am using the latest built of Interactive Brokers TWS 973.2h Sep25. It seems the read-only mode has disappeared. Anyone faced the same issue? I would like to have this feature but it suddenly disappeared. I wonder if it's been removed by IB or some settings problem on my side. The read-only mode feature is still available on the mobile app.
I too thought it disappeared for a second, but turns out that they just screwed up the window size. When you get the post-login dialog, simply grab an edge and resize it taller, the option is still there.