Gen. 4 Rocker Panel remounting advice needed

Guidance needed in refastening the stock plastic rocker panel on a 2019 standard Prius. We ran over a tree branch which became wedged in the driver's side panel. After pulling it out some panel segments (or partial segments) remained loose and were snapped back together so the panel appears intact. However, the panel does not fit tight against the body along its length - it's suspended between its front and rear attachments and is a bit loose when shaken, as opposed to the passenger side panel which is secured firmly. Nothing visible on the underside of the panel appears to be broken and I can't see where anything would fasten or snap in to the body above the panel.

Moderator - please redirect as necessary.