Discord used to be popular with gamers, now it's hugely popular amongst non-gamers too. Historically Discord has been very lax regarding features that are available for parents to help keep their children safe, but this has recently changed, albeit the changes are a minuscule step in the right direction, at least it's something.
Essentially, like many other apps, Discord now has a Family Center. Once set up parents can see:
You can read more about these functions and limitations HERE, and THIS page will show parents how to set up Family Center.