When using only the Pen in Notion 6 on a SP3, how to bring up context menu (right click) when notes are highlighted?

If I highlight notes with the pen on a Surface Pro, when no keyboard is attached, I can't bring up the context menu to Set Tacet etc. The only way I can get it to work is plugging a mouse in and right clicking. I must be missing something but it is not mentioned in the manual. Thanks