World Edit Mini

You can run the command /function editor:get_items to get several swords:

1. Toggle (gold): Select the block position you are looking at, or de-select it if it is already selected.
2. Set Blocks (netherite): Set all selected block positions to the block you are currently looking at.
3. Cancel (wooden): De-select all selected blocks.
4. Fill Cube (diamond): Fill all the blocks in a cuboid containing all selected positions, with the block you are currently looking at.
5. Move (iron): Move all selected positions one block in the direction you are looking.

Have fun! :)

Note: As the "fill cube" method is relatively inefficent due to command limitations, /gamerule maxCommandChainLength (by default set to 65536) approximately determines the maximum number of blocks that may be filled. You may wish to set this to a larger value (for example, /gamerule maxCommandChainLength 524288).

(Disclaimer: I haven't used WorldEdit and have no idea how it works, but I wasn't really sure what else to name this datapack. I just made this because I wanted my friends to easily be able to use the /fill command.)