Suppress default app shortcuts and use BTT shortcuts

Hi - love the tool, have a question that I was not able to search for and some play around didn't provide me with the results.

Here is what I want.
Using a common keyboard shortcut I want to open a specific from anywhere I am.

Specifically - I want to open my Calendar in Chome with the shortcut Opt+Cmd+Space

What is happening
The shortcut(Opt+Cmd+Space) is so commonly used in other apps that on pressing the keys, triggers the app shortcut

What I tried
I tried selecting the "No Action" action and after that my preferred actions - but that results in no action trigger at all.

Can someone help me with this problem ..
Thanks in advance