I just discovered the setting to change the thumbnail file format from .jpg to .heic

Since my Peakto preview folder runs at about 250GB, this seems like a reasonable choice. Import times doesn't really matter to me, I have more than 700k images currently in Peakto and display times shouldn't be too much different to jpg.

Changing to heic, do i need to re-import everything if i like the thumbnails to be stored as .heic, or is there any other way to achieve this?