Normally, MetaMask displays ERC-20 standard tokens (or standard tokens) you own on your account page. However, with the proliferation of tokens on the Ethereum network, MetaMask doesn't keep an authoritative list--but it does allow you to add any ERC-20 compliant token you hold.
To see your tokens, click on the Assets tab. Your tokens should be listed under this tab.
If your token is not listed automatically, you may add the tokens manually. On your account page, scroll down to find the Add Token button. This will bring you to a search bar, where you can find popular (standard) tokens easily.
Once added, you can Hide the token from your token list as well by clicking the three dots icon in the top right corner, and proceeding to Hide (token name).
If the token you search for is not among the most popular tokens, the search bar may not return the token you queried. In this case, you could add a custom token (manually).
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