Chart performance changes depending on base currency

Hello, I have a vault in EUR. When I add a new instrument, say an ETF tracking the MSCI World, its returns are in USD. If I set this instrument’s currency to USD, its performance in the Chart section is different than if I set this instrument’s currency to EUR. How does it work? What determines the difference in the performance? I don’t know what currency I should set for the securities I add. I want to be sure that in the performance and chart sections I am comparing apples to apples.

May anyone explain in detail what one should do in this situation?

Thanks!

Use the currency in which you bought the stock.

Hi, thanks for the response.

I am using the Chart section just to do backtesting and comparisons, I am not actually buying the securities. I want to make sure I am comparing the performances of the securities properly.

Well then you need to compare similar things or you make use of the benchmark. Ultimately you need to define what and which KPI’s you like to analyze.