The position of 'GYM' button on the top box of codeforces seems change.
The position now:
While the position in my memory:
It make sense since more and more people start to use gym for practice and (from my point of view) the number of contests in gym are booming recently.
UPD:
After check some screenshots several years ago, it seems I got it wrong. The position of GYM button have never changed.
Maybe as a kind of drug, codeforces not only make me addicted, but also casue me some illusions :(
Anyway, sorry for bothering.