According to Biden he said that Harris handled, "everything from foreign policy to domestic policy" under his administration. Clearly she was given the power to handle things. If she had no power why would she be allowed to handle things?
Now, Biden (to my understanding) never went into specific details and from how he speaks I can't be certain if he was trying to praise Harris for her work or to throw her under the bus. My guess it would be the former, but you never know with Biden because he did come out and say that the Inflation Reduction Act had nothing to do with reducing inflation and he wishes they never named it that.
The hard right denial of a woman's right to body autonomy that Trump and JD Vance have campaigned on took a body blow as Melania Trump came out in support of women's rights, stating there is no room to compromise that right.