Can I get the advanced ('legacy') editor installed on my instance?

[Peter Kidson]

  The table-handling in the new editor is just too crippled  to be workable.

[Deepanshu Natani]

Hi @Peter Kidson 

Please checkout this article: https://community.atlassian.com/t5/Confluence-Cloud-articles/Change-to-your-content-is-in-your-hands/ba-p/1324476

[Nic Brough -Adaptavist-]

Not properly, but there's a comment on CONFCLOUD-65695 about using a template which triggers the old editor to be used for a page.  I'm not sure for how much longer it may be available though.