In the 6.3 release note, changes to the Sampling dialog are described as follows:
(1) Addition of “With replacement” checkbutton
(2) Addition of “Keep order” checkbutton
Commit https://gerrit.libreoffice.org/c/core/+/65574 refers.
Some mention of these should be added to the help files.
No mention there.
Update on file to touch
Olivier Hallot committed a patch related to this issue.
It has been pushed to "master":
tdf#132906 Update Sampling statistics dialog