XYplorer Beta Club

I read in the help file it says "Check it to have all thumbnails in the current list created at once (not just the ones that are currently visible in the viewport)."

idk what that means? what is the current list? is it all the tabs I have open? or something else?

Cause I only want thumbnails cache for the specific folders I use (the tabs I have open) and not the entire parent directory sub-directories.

For every folder you show / open in XY and for which you use any of the three thumbnails view modes.
E.g. if you have
R:\Pictures\Holidays\Timbuktu

but you only ever open its parent
R:\Pictures\Holidays

XY won't generate thumbs for the Timbuktu subfolder

But you shouldn't probably tick:
Configuration | Preview | Thumbnails | [ ] Include search results
...

Okay thanks for the clarification.