New: Multipage Beta

[ming]

@LinoPino - split pane is working on cloud now! Let me know if you run into anything!

Multipage Changelog

Split Pane is now supported on cloud 3.79.0! It will be on next Wednesday's 3.79.0 edge on-prem release as well You can add one split pane to each page and the split pane will be in page scope. [splitPane]