you can’t adjust the coregui only turn it on or off (from that i’m aware of). you could as an alternative make a custom playerlist in the style preference you’d like (or similar to the roblox one) and create custom badges or use the roblox ones.
You could get the leaderboard’s core gui script, and then edit it to your liking and then just make a screengui call it playerlist and put the local script in there.
( not sure if this works anymore, worked for me with the old roblox leaderboard )