Mob spawning

Alright so here me out right. So my little cousin is afraid of Minecraft spiders right and I was thinking in the bedrock / java menu you can disable certain mobs from spawning without having to play on peaceful so you can progress on the game without him or others being in fear right just like a sub menu next to your difficulty and then if you could maybe remove the options for certain spawners to if that is not to much to ask thank you