while staking you can't access the coin staked until the staking period is over but you will get your passive income footing the percentage the exchange agreed on.
This depends on different policies of different platform, on Binance, you decide to lock your coins for 15, 30, 60, 90 days, also there is flexible staking where you can pull out at any given time. On apeswap, you can stake and unstake anytime you want.
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Staking crypto in CEX is not recommended.
Why do you think this? isn't it better to keep assets somewhere you trust?
To be honest, I had more trust in CEX exchanges like Binance, Kucoin, Cex, rather than some very new platform. Especially if they offer almost the same APR.
Cex APY is too low compare to Dex, that's why most investors consider staking on dex. Honestly, staking is risky whether on cex or dex but you should be careful where you operate this.