Hi Roshan,
Welcome to Coda and the Community!
Coda has a pack called Coda Doc List Pack, extend Coda with Coda Doc List - Coda. it has quite a few goodies in there, including a sync table that will list all your docs. You can then add columns for whatever classification you want, and sort/ group using that,
(Why do you have multiple Workspaces? That is very seldom used. In general, I find people create new tables too quickly, they create new docs too quickly. Workspaces - probably only needed if you work in two different organisations.)