Help screen invisible in Parallels Dekstop for Mac 12

I opened the Parallels Desktop Help.
I wanted to make the screen smaller in width.
As I could not change it to enlarge it, I click on the Green button at the top left (was marked with + sign) and help screen disappeared.

Stopped and started Parallels but no way to get the help pages

 

Hi, could you please provide us with the screenshot?

 

Discussed it using chat.
It is a General Mac OS problem of the help viewer.

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Thanks a lot for sharing this info!