If not, you can just remove the new phase, it will work find as long as the split didn't change

Now the feature page looks like

Whereas the experiment page says 12% of traffic

The results are all together though, thank you. I just want to verify that I am sending 26% of traffic (The feature page value) to the experiment.

I would also be interested in general guidance about whether I should be configuring experiments from the feature tab or the experiments tab.

You configure the experiment from the feature rules

the experiment report settings only apply to the analysis