I think it is not possible. All the projects (coins) has their own wallet to hodle their coin. And if Op is looking for a wallet that he can use to hold or store his coin on a desktop computer, then, it would be a wallet like "Trustwallet" because in Trustwallet there are different wallet addresses which one can use to store different cryptos but even at that the coin can't be stored in one wallet but in separate wallets. Therefore I don't know where one wallet can be used to store different cryptos.
I'm sure he meant wallet software, not a single network (blockchain) wallet. But even if it is the latter, your statement is still not true. There are numerous wallets that support multiple crypto assets. For example, most wallets that communicate with the Ethereum blockchain support multiple crypto assets (tokens) on a single address. ETH, USDT, USDC, DAI, SHIB... to name a few.
I am not an expert or wallet analysis and I made my comment base on the Op content and not other people replies. And if you understand my comment I made mentioned of "Trustwallet" which can be used to store more cryptos with different addresses I don't know where my comment is nonsense and not truth. Well in life everyone has their own way of understanding. And apart from Trustwallet, one can use unstoppable wallet as well. I made the comment base on the Op please.