Hi youngji22 ,
The theme switch broke a lot of things and it looks like been reverted.
Nothing has been reverted, but we have already rolled out many fixes. If you find anything else wrong, please do open a ticket with screenshots and browser details, and we'll have it fixed ASAP 😃
Lastly, I do apologize about the rollout handling. It is not what we wanted either, but due to some internal missteps and time constraints, we had to push forward or risk delaying other things. For any future shakeups in design, we'll definitely focus on users being able to A/B it as a top priority.