If I go the tab Insights and view the card Asset Worth, I see the value of my 4 highest holdings over time. If I open the card and change out the assets and close the card, then my chosen assets are not saved. If I open the card and change the time range that is saved.

I expect the asset change to be saved as well.

Another reason I expect the chosen assets to be saves is because the card Portfolio Performance does save my changes.