If the intraday charts have "Active Quote Subscription" set in settings, then they subscribe to the streamer for the symbol on the chart and for any compare symbols you have. But historical (daily) charts are always passive - that is, if there is data coming in for the symbol, they update, otherwise they do not. Place any "compare symbols" in the portfolio you're monitoring, and that data will update on the historical charts.
Your second question: not sure, could be several things - what happens if you right-click on that rectangle? Check in the View ribbon menu tab the Options button on the left - in the submenu you may have some option checked that shows on the chart.