Seems like it depends on the individual application on whether or not this feature works. Maybe they aren't using the built-in system cursor? Working examples: Brave browser (essentially Chromium) Slack Notepad Ubuntu console Non-working examples: Notepad++ Visual Studio Code Git Bash LibreOffice

I distinctly remember having to do it in a typing class (typewriters and word processors) in the mid 90s.

I was trained to do two spaces very early on. Two spaces (I did it before this sentence without thinking about it) after the period is in my muscle memory. I imagine there's an age cut-off to this habit.