If you are using scope block inorder to display the simulated result.
Then use Input Ports and Layout properties of scope block inorder to dispaly data in one window from multiple windows
Number of Input Ports (suppose n) is used to display n signals within same scope block
Layout Property helps display data in seperate axes. If the number of displays is equal to the number of ports, signals from each port appear on separate displays. If the number of displays is less than the number of ports, signals from additional ports appear on the last display. For layouts with multiple columns and rows, ports are mapped down then across.
Refer to following documentation: