Trading currency is irrelevant, as long as it’s not some kind of currency hedged shit. You can always convert currency anytime when you need. Much more important is internal currency exposure - where are the companies you invested in making money as that determines their earnings - the basis of stock valuation and how much dividend they’ll afford to pay
Often especially for smaller companies, their stock’s trading currency will reflect the main currency they’re exposed to. This is less true for giant multinationals which rake in truckloads of cash from all over the world. Sometimes the stock’s currency is even not indicative at all: e.g. Philip Morris, a USD traded stock has zero exposure to US market (US part of biz is handled by Altria) and Nestle, a CHF stock has only a percent or two exposure to swiss market. INR rate has more influence on it than CHF
An ETF or a mutual fund is just a weighted sum of companies. Ultimately what matters is still the weighted sum of their currency exposures, but that’s not an easily available statistic. Most commonly you’ll just know the breakdown of stocks they invested in by country, so keep in mind that’s only an imperfect proxy to what ultimately matters