History depth depends on the market, the interval and your plan. Scroll or pan back and the chart loads older candles as you go.
OpenMarket Plus extends the lookback range. When you pan back far enough to reach the start of the history your plan includes, the chart tells you so and offers the upgrade right there.
The market itself sets a limit too: a coin that listed last year has no older candles, and crypto, US stocks and futures each start at different dates. If a market you need stops earlier than you expect, tell the team through Reach out.