1) With the Back button in the Emulator, it stopps the prgram and returns to the Designer if it was active and connected.
If you use the debugging you can stop both, the IDE and the Emulator, in the IDE on the green Stop button in the debugger in the lower left corner.
2)When the Designer is connected to the Emulator and you run the program and stop it, you get back to the Designer and Emulator as you left it before.
How to do:
1) Run the IDE.
2) Load the program.
3) Run the Emulator.
4) Run the Designer.
5) Connect the Designer.
6) Eventually you need to load a layout file.
7) Now you can design your layout.
8) Add code.
9) Run the program with the debugger.
10) Stop the program in the IDE.
You get back to point 7) Designer, 8) IDE.
Best regards.