It would be a good idea to add a feature that allows investors to sort their holdings into different portfolios based on their investing goals/sectors.
Rather than have all the holdings grouped together in the portfolio section.
EG:
Dividend portfolio
Growth portfolio
EM
Spec
ETF
It is a good idea and it was requested before in different forms: Specialised allocations. Including sectors, diversification & Portafolio grouped by sector
Also combined with what @Vedran was proposing in Portfolio graph, probably a nice grouping feature can be implemented at the Allocation section from Portfolio tab.
I think it can copy the customization idea of My Watchlist from main tab and also allow different view graphs (except circle/“pie” one), as example: stacked area chart.
Hopefully we will see something along those lines released soon. 
That would be a very nice option that would allow to better manage our shares. I have shares in many company and it’s a bit difficults to follow differents strategy.