Time interval Return / Volatility

[RudyNL]

I just started to use Portfolio Performance and stored my portfolio which is only covering a few days.
If I am opening Reports => Performance => Return / Volatility the graph seems to be based on the time interval of my portfolio; e.g. a few days. Changing the the time interval to 1 year, 3 years or longer doesn't change the graph.
If I start a dummy second portfolio with only one equity which I own for 10 years the behavior of Reports => Performance => Return / Volatility changes. Now the graph changes depending on the time interval of 1 year, 3 years or longer.

The expected behavior:

• The analysis of a portfolio Reports => Performance => Return / Volatility is expected to be independent of any other additional portfolio
• Return / Volatility analyses are mainly used for investment decisions. So referring to old data before the start of the own portfolio should be possible. That means that you can select the time interval 1 year, 3 years or longer.
• The current behavior (without the dummy portfolio) should be reserved for the interval "H" = holding period of the portfolio
• It is understood that the "Entire Portfolio" has a special position because it can only be analyzed for the time interval which corresponds with its existence. So it should only be presented if the selected time interval is shorter then the existence of the portfolio.

I am using Linux with flatpack Portfolio Performance 0.70.4