You'll need an app to open this dash plugin-link

[Luminossus]

When trying to use shift+h:

[Twylixy]

@mycodesucksx2
You need to install Zeal, then configure it.
Download instructions here: https://zealdocs.org/download.html
Usage instructions here: https://zealdocs.org/usage.html
Then you can use dash extensions by Ctrl+H, but if you are using external libraries it will not provide anything, because this is offline docs, which you download and then use.