I have noted a few times that one thing you have to be careful about in two dimensional plots which show genetic variance is that the dimensions in which the data are projected upon are often generated from the data itself. So adding more data can change the spatial relationships of previous data points. Additionally, in 23andMe’s global similarity advanced plot you are projected onto the dimensions generated from the HGDP data set. There are some practical reasons for this. First, it’s computationally intensive to recalculate components of variance every time someone is added to the data set. Second, it isn’t as if the ethnic identity of any given individual is validated. What would you do if an alien sent in a kit and spuriously put “French” as their ancestry?
So, in reply to this comment: “Let me rephrase: is there any difference when you switch to the world-wide plot? I imagine not, or you would’ve mentioned it.” Actually, there is a slight difference. Below on the right you have a “world view,” with my position being marked with green, and on the left a “zoom in” for Central/South Asia in the HGDP data set.