Can't grab edges of effects on Windows without changing zoom level

On Windows 10, (1920x1080 Display with default character/spacing settings) installing a fresh copy of Kdenlive (default comnfiguration with Zoom Level 13/21) i can't grab the edge of an effect (automatically placed and generated by kdenlive, for example the WIPE from 2 different clips) without changing zoom level to 14/21 or more...

I known that it's just necessary to change the zoom, but better to start with 14/21 to be sure new users can grab edges at first experience.