for i,v in pairs(script.Parent.Holder["1"]:GetChildren()) do
if v.Position < UDim2.new(0.056, 0,0.747, 0) then -- or > still didn't work
v:Destroy()
end
end
error: attempt to compare two userdata values
idk what's the reason i just wanna fix that very quick

2 comments
Try using magnitude so like v.Position.magnitude or try do v.Position.X < and then make like a part with that position and link to the X value of that. It might work :D
That won't work he is using GUI objects not parts.