ALT+I+L used to insert a horizontal line into the text.
How do I insert a horizontal line - as a break - into the text?
Will I have to install an older version … as I had to do before, when a shortcut was removed from LO?
Is the following topic helpful for you:
How to insert a horizontal line LibreOffice 25.8
What exactly do you mean?
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Ctrl + Y = horizontal line
Why was it moved? Maybe to justify a job. Moving it just to look like something is being done!
Because it has always been a paragraph style.

Here with LO 24.8.7.2, and Ctrl+Y is for Redo.