PLEASE NOTE: I am not responsible for the damage of your worlds so make sure to back them up just in case.

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I'm gonna show you how to remove resource packs and or behavior packs from your existing minecraft bedrock world.
This can be useful if your updating behavior packs / resource packs

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Step 1: Extract your world from your worlds folder.

If the game is located on your C:\ drive, copy paste this:
C:\Users\YOUR USER\AppData\Local\Packages\Microsoft.MinecraftUWP_8wekyb3d8bbwe\LocalState\games\com.mojang\minecraftWorlds

If your game is located on your D:\ drive, copy paste this:
D:\WpSystem\S-1-5-21-492187133-4075019016-2810172500-1004\AppData\Local\Packages\Microsoft.MinecraftUWP_8wekyb3d8bbwe\LocalState\games\com.mojang\minecraftWorlds

(You might have file permission issues, if so just make what ever world(s) your backing up into a zip folder and save it elsewhere then extract. And turn off read only for that folder.)

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Step 2: Delete the appropriate resource pack / behavior pack folders with the equivalent .json file(s).

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Step 3: Repackage your world files. Do this by adding all of the files to a .zip file. After, rename the file extension (.zip) to (.mcworld) then open the file to reimport your world.

(You can use a the file manager that comes with windows to package your world files or an external one like 7-Zip.)