If you were logged in to multiple Lemmy accounts on the app, you could easily tell which one is currently selected if they affected the colour scheme of the app.
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Since themes is part of settings, it might be better to have separate settings for each account.
I know sync has that option.
There are already separate settings per account, but not themes. At least when I made changes in one account, like remove the tab bar, it did not take over to the second account I have in the app.