You can set Parallels virtual machine to occupy your entire screen, so it looks just like it would if you were using a Windows PC. In Full Screen mode, Mac OS X and all of the Parallels Desktop controls are hidden.
To switch to Full Screen mode, do one of the following:
From Coherence mode, click the Parallels icon || in the menu bar, then choose Exit Coherence. Then click the View menu and select Enter Full Screen.
From Window mode, choose View > Enter Full Screen or click the Full Screen icon in the top right corner of the virtual machine window.
To exit Full Screen mode, do one of the following:
Move the pointer to the top of the screen until the macOS menu bar appears and click View > Exit Full Screen.