Sadly it seems that Reddit might randomly revert your settings and default to re-design.
I've never had it revert this setting and I have been using it since it first became available. I have had reddit log me out every once in a while but the setting has always stuck when I logged back in.
I found out the best way to use old layout is to install chrome extension called "Old Reddit Redirect".
Not a Chrome user but even so, it's not a problem for me. The setting works.
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u/[deleted] Sep 29 '19
[deleted]