How can you change biomes on Minecraft Bedrock Edition?
If you want to create a new world there's always a seed…
If you then go to the world settings (of course before you created them) there's an arrow there. If you click on this arrow there are different biomes.
Hope I could help you. (‾◡◝)
Do you mean by a pre-existing world or by creating a world?
In an already existing world.
For this you have to install the Mod WorldEdit.
Unfortunately, I don't know how this works in the Bedrock Edition
You cant
bro thinks u can get mods on consoles 💀
Ever consider playing bedrock on a pc 💀
You actually can you just have to download one thing lol