Can't change settings in the "world.yml" file, PlotSquared

Hi, I made my plot world with the bridge template, and everything was ok until I realized that I couldn't drop items outside of a plot or in an unclaimed plot. So I figured out that I could fix it adding "misc_spawn_unowned" to true in the world.yml file, but I'm having a serious problem with world.yml file that everything I change or add in that file, It doesn't change nothing, Even if I do it with the server turned off, or reload the plugin, I can't change anything in the world.yml, I know it because I tried changing other setting and it didn't work. The changes that I did still being on the world.yml but it doesn't seem to work in the server, so I basically want to add "misc_spawn_unowned" to true in the world.yml, but I don't know how.

Its in plotsquared

This is the world.yml file of plotsquared, "parcelas" is the name of the plot world, I can send you a link with an image more detailed if you want:
First part: https://imgur.com/a/bgAIm
Second part: https://imgur.com/a/Cy4xf
worlds:
parcelas:
generator:
plugin: PlotSquared
plot:
height: 64
floor:
- '2:0'
biome: FOREST
size: 50
bedrock: true
create_signs: false
filling:
- '1:0'
auto_merge: false
event:
spawn:
breeding: false
egg: false
custom: true
pvp: false
pve: false
economy:
use: false
prices:
claim: 100.0
sell: 75.0
merge: 100.0
home:
allow-nonmembers: false
default: side
wall:
height: 64
filling: '1:0'
block: '44:0'
block_claimed: '44:1'
road:
block: '155:0'
height: 64
width: 12
misc_spawn_unowned: true
world:
border: false
gamemode: creative
max_height: 256
min_height: 1
schematic:
file: 'null'
on_claim: false
specify_on_claim: false
schematics: []
limits:
max-members: 128
chat:
enabled: false
flags: {}
natural_mob_spawning: false
mob_spawner_spawning: false

Because of this https://github.com/IntellectualSites/PlotSquared/issues/1506
The guy that finished the thread was the owner of plotsquared

I will try it out thanks for helping you are the best guys
Thanks for taking the time to respond all my replies thienbao860