Hi hamidrezax,
For Query 2) If you need to control the speed of the fading effect, you can increase the distance between the fade positions and the key position.
For Query 3) Could you please share a screenshot indicating which button are you referring to?
To stick your panel groups, you may click and drag them by the dark grey bar above the panel group (http://prntscr.com/4el5qu). You can drag this bar to the right or left, wherever you desire.
You can even stick it to the left: click and drag it to the left, and release the mouse button when you see a blue line to the left of the rulers.