Resolution of local display is 1920 x 1080, and the display of remote desktop is set to 1440 x 1050. When maximize the window of remote desktop, both vertical and horizontal scroll bar showed.
Horizontal scroll bar should not be showed because there is plenty of space on local display (1920 is far larger than 1440). And when not maximized, resize the remote desktop window to a wider size cause horizontal scroll bar to disappear.