Expand Pool on the larger replaced disks. The UI do not show the new expanded size (free size)

To increas the disk space I have replaced all the disks in a RAIDZ2 pool with larger disk, with the same disk size. But the pool free disk size is still the same.
My steps done.

1. Check auto expand option = true
2. Replace all four disks from 4TB to 16TB
3. After last re-silvering it seems to be ok in shell view
   Image may be NSFW.
   Clik here to view.
4. But in UI it still was 100% used still after 24h
   Image may be NSFW.
   Clik here to view.

Is the safe solution to export and import the pool?