Open a spreadsheet and then the built-in Help. Search for "AutoInput" in the Index and click on item "AutoInput function on/off". You get the text
To turn the AutoInput on and off, set or remove the check mark in front of Tools - Cell Contents - AutoInput.
The sub menu "Cell Contents" does no longer exists and the item "AutoInput" is a direct item in the menu "Tools".
I see the wrong text in versions 5.2.x, 5.3.x and master.
There exists additional pages with the no longer existing sub menu "Cell Contents". I found so far references in the following pages:
Deactivating Automatic Changes (was already in first post)
Patch sent to gerrit:
Olivier Hallot committed a patch related to this issue.
It has been pushed to "master":
tdf#106861 - fix Autoinput entry in menu, plus
Is this bug fixed?
If so, could you please close it as RESOLVED FIXED?