How to disable Cmd+Tab when using Parallels

First, I'm sorry because my english so bad, please understand and help me.
2 months ago, I installed Parallels and configuring something. At time, when using Paralles in Full screen, Cmd + Tab has been disable, I only used trackpad and swipe with four fingers to swipe to Mac OSX and any applications full screen. And now, I re-installed Paralles but I don't know how to configuring same that time. now, when using Paralles full screen, CMD + tab still swipe to Mac OS.
Please help me! Thanks so much.

 

please open Parallels Desktop menu at the top of the screen while Parallels is running --> click Preferences --> apply keyboard shortcut you need

 

still can't

 

which exactly mapping did you try? It should have been Cmd+Tab to Ctrl+Tab