GM crypto fam. Happy December!
I've seen that several exchanges are trying to increase client transparency after the FTX crash by disclosing their Proof of Reserves. Since there is no way to determine whether the exchange is not using client funds to cover hidden debt or anything, I personally don't buy any of this.
Proof of reserve is a good idea and Binance has already implemented this to show their liquidity to their users. That worked well for them! I am not sure if anyone else is doing that, but if other exchanges are planning to follow the same, that will be great!
However, that's not the only indicator you should rely on. It doesn't show their debt in the market. It doesn't show where they have invested their money. It doesn't show how quickly they can liquidate their investment if needed.
In order to achieve complete control of your funds, either move to a decentralized exchange that doesn't hold your fund, or stop keeping your funds in the exchange wallet. As simple as that!