If you want to remove an existing Leggy Mutation, check out this tip from Reddit:
https://www.reddit.com/r/noita/comments/ngqn71/comment/h03zm3e/


go to your save folder
(something like C:\Users\[your profile name]\AppData\LocalLow\Nolla_Games_Noita\save00

make a backup of player.xml, just in case

open player.xml (notepad will do)

look for "leggy"

whole entry starts with "<Entity" and says something about perk enabled

Select everything starting from "<Entity" to "</Entity>" that includes anything about leggy or lukki

There are a lot of entries, one for each limb

Once selected, delete the whole lukki thing, save and load your game

perk gone

Its incompatible with removable perks mod

it is already too late
my run is already done for...

Noice

Thank you for creating this mod. I love Lukki Mutation with this mod.

Photoshop

Offtopic: How did you move the levitation bar above your character, is that another mod or did you photoshop it?
I'm asking because i'm looking for a mod like that.

A simple change, but one that takes Lukki Mutation from a bad perk you want to avoid to one that's actually helpful.