1. Where do the topics go? after a Minute I set my eyes on it and I come back again to check for that topic I won't find it
There are two destination sets for topics: Trashcan, and any board in the forum.
We as users can not delete our topics to trashcan. Only moderators can do so.
2. Who has access to locked topics in the forum apart from the creator of that topic?
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There are two types of locked topics: Locked by creators; locked by global moderators or admins.
The first type: it is clear that creators can have access to their locked topics when they unlock those topics.
The second type: only global moderators or admins can have access to such escalating locked topics.
People who have userscripts can get access to those locked topics and can quote.
A kinda shitty script for quoting posts in locked topics