Tried a search, couldn’t see any other posts about it…
Hover your mouse over any plugin in your Inserts (Inspector/Channel Settings/MixConsole) - a ‘pop-up’ ToolTip appears and says ‘ Double Click to Open/Close Editor’.
Its not necessary; single click is sufficient.
Anyone confirm please.?
Hi,
You are right. Single click is enough. But double-click is also not wrong. 
Yes, single click does the job and in case you didn’t realise, you can also disable the ToolTip in preferences (General > Show Tips).
Ok. Understood. Thanks gents for your responses.
I will go back and mark this as ‘Solved’ for now. 
Bob