Can we Revert Spaces after enabling and creating second space?

I have configured phabricator to enable spaces, then I have configured second space rather than the default one.

Currently, New space have tickets and wikis under it and the default space have different tickets and wiki pages under it.

Is it possible to disable spaces and get all tickets and wiki pages under the default (no space) again as fresh phabricator installation layout (no spaces at all) ?

No, there’s no way to revert/undo Spaces.