I don't want my child to play multiplayer on Minecraft since he joins random worlds that belong to strangers, are there any ways to make it so he can't join servers?
Minecraft – set parental controls on Minecraft
minecraft-java-edition
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A further update: As of Minecraft Release 1.0 (as in, after Alpha and after Beta), SMP offers everything single-player does, including Survival mode, Creative mode, and the Nether and End regions. There are still glitches that only affect SMP, meaning certain animations and so forth might not play properly, but the game is no longer woefully incomplete in SMP.
As of Release 1.3.1, SMP and SSP are now using identical code. Single-player is now a one-person instance of multiplayer. Thus, all differences between the two have been reconciled.
Might you have created a new profile, and used a different folder for your Minecraft files? That is quite plausible, especially if you've been clicking on the profiles buttons in the bottom left of the launcher.
Do you have any different profiles listed in the drop down box (highlighted in the image below)? If so, try selecting each profile, in turn before clicking play. You might just find your missing servers have been on a different profile.
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Best Answer
To disable joining servers, you can simply turn off internet on the computer. If you don't want to do this manually or think that the child can enable it on their own, you can blacklist some Minecraft related things in a firewall, basically the opposite of this question. You could also choose some not commonly used, but still stable version, because you can only join with the same version that the server is on. I would for example recommend 1.12.2-pre2 for that, it's basically the same as 1.12.2, but not compatible with 1.12.2 servers.
You can also change chat settings to make the chat completely invisible.
If you want the child to have an easier game, you can lock it into "Peaceful" difficulty.
If you don't want the child to exit the world, join a different one that you play on and destroy things on there (TangoTek used to have a lot of problems with that), then you should make a new launcher profile that uses a different
.minecraftfolder, that way the other worlds do not appear in the world list.