Subject says it all. I’d like to clear this listing as it has projects that no longer exist in it. I’ve done a search and haven’t found anything… I’m sure it’s a simple thing and I apologize if it is staring me in the face …
Cheers
Denis
It isn’t a dumb question 
… there is no specific command for this.
The workaround is to temporarily move your projects to a different folder, so that Cubase won’t find them on next launch (which will refresh the “Recent Projects” list). Then you can put the projects back to their place.
I know it would be something simple, thank you Vic - you’re a gem …
You mean I should be locked up in the Tower of London? 
Hopefully not - the acoustics are terrible!!
Clear list feature please.