[Feature Request] Sum of the selected portfolios

[buongiorgio]

Hi there,
thanks for the app, very useful!

My idea for a new feature is rather simple: show a sum of the selected / active portfolios.

My use case. I have 4 portfolios, 3 of them are mine (separated by investment strategy), one are my mum investing. I would like to hide my mum's portfolio and see the total value of my investments across portfolios.

Bye!