Text file "Lock" feature

Please add a “lock” feature so that a text file cannot be modified by accident. :slight_smile:

There are no plans to implement something like that (you can search around here if you wish to see prior discussions as to the reasons why). However do note you can already lock down the text of a document with one simple shortcut: Ctrl-5 on Windows and Cmd-5 on Mac. The name of the feature that triggers is “Snapshots”, which you’ll find documented in the user manual PDF, under §15.6, Using Snapshots.