was defined.
When I commented out this line, I was able to get multiple lines.
Even if RowSelectionType is Single,
I think it’s strange behavior that multiple rows can be selected in the actual application,
but anyway, it was my setting mistake, so I’m sorry.
If I remember correctly there was a discussion about this not long ago and there should be a bug report (can’t find the number right now). I hope this is fixed for the next Xojo release.
Edit: It looks like is already fixed for the next release, case #68934