Wanted to see all the users (about 150) in one page, so i changed the posts per page (from page options in the users.php at the backend) to 180.
When re-freshed, got the "Fatal error: Allowed memory size... tried to allocate" etc.
Tried to solve it following the steps you mention here: https://premium.wpmudev.org/blog/increase-memory-limit/
But without luck.
Is there another way, maybe to change the posts_per_page meta value? I do not know where it's stored.
Thanks in advance.