There was a similar thread earlier located here.
My response then is pretty much the same now, except I’ve streamlined the monthly balance updates a bit.
I connected our investment accounts for a while, but it created too much noise in my transaction list, so I disconnected them. However, since I want our investment accounts included in our net worth report, I added them as manual accounts and update their balances once a month. This way I can see the trend of our net worth and see our assets breakdown, including Retirement and Non-Retiremet Investments.