We've just recently upgraded Portfolio to 3.9 from 2.21.
We found that none of our existing plans could be upgraded to the new interface.
While we couldn't find any documentation to corroborate, we thought this was intentional and that we had to build new plans from scratch.
After doing so we reverted one of the plans to the 2.0 so we could look at some of the old reports and now we are unable to re-enable the 3.x interface.
Is there a setting that's needed to move between the two?
Documentation suggests this isn't by design.
When looking at the plan configurations page for a Live Plan you should see the option to enable the new planning experience under the op configuration option like the following screenshot:
What is this screen looking like for you?
Regardless, the option should be there but would be greyed out if your Portfolio global permission settings were set to Viewer as covered here, and you would need Portfolio Restricted User or higher to enable the new experience.
However if it's not the global permission, I would expect something failed during the upgrade to 3.9, check the logging to see if there are any explicit errors during the upgrade window for portfolio, and I can take a closer look.
The option wasn't appearing at all:
However support was able to direct me to this KB article when trying to address a separate issue:
Following the steps suggested there, appears to have resolved the issue.
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