How can I print the current selection criteria (i.e. query parameters)?
Add an expression component to your report and use its "QueryParam" function, e.g. QueryParam('CustomerQuery','StartDate').
When I preview a report I don't see all horizontal lines as they are on the report layout. Why?
The horizontal lines are still there and will be printed, but the report preview must scale the report output down to make it fit to the screen. Because of this scaling, thin horizontal lines may disappear.
How can I print only one data record?
Leave the main report dataset empty in "Report|Datasets...".
How can I use Inches instead of MM in the report editor?
This can be set with the menu item "View|Options".