When switching mouse Primary and Secondary Buttons (i.e. from right-hand to left-hand setup), you will not be able to change a field size with the mouse.
1-Switch the mouse primary and secondary buttons:
Click on Windows Start Button -> Control Panel -> Select Mouse -> Tick “Switch Primary and Secondary Buttons” -> click Apply and then OK
2-Create a new form with Designer 7.1 and add a text field
3-Try to change the text field’s size with the mouse. This will not work.
It is expected that the field’s size can be changed by left handed users
This is a bug in Designer 7.1.
This has been fixed in Designer 8.0. and later.