Hi Mark,
In my setup, in General Preferences > 'Other' tab, 'Initial Data Type in Data Register" is set to 'All Transactions' and 'Action When Double Clicking An Investment in Portfolio Editor' is set to 'Data Register'.
I open the Data Register of an investment. So it opens in the 'All Transactions' section.
I select the 'Prices' section of the Data Register because I want now to see the prices.
I keep the Data Register window open, and now I double-click on another investment in the Portfolio Editor. Or, I click on an other investment from a report.
The result here is that the Data Register is now back to the 'All Transactions' section for this other investment.
But in this case where the Data Register window is already open and another investment is selected from outside the Data Register (Portfolio Editor, Report...) to display its data, the Data Register could stay in the section the user was, instead of going back to the default section defined in the General Preferences.
That would be I think handier to review a particular data type for several investments, selected one after the other from the Portfolio Editor or from a report.