If you are not logged in you will see the 2 pane.

Updated this Pleroma to 2.5.0. On PC, it changed to 3-pane display.

https://pleroma.social/announcements/2022/12/23/pleroma-release-2.5.0/
https://git.pleroma.social/pleroma/pleroma/-/releases/v2.5.0

Update Marked to v4.2.5 in Strapdown.js

https://github.com/fu-sen/strapdown
https://github.com/fu-sen/strapdown.js
日本語 https://balloon-jp.vercel.app/strapdown.js/