Hi,
my question is simple, can I remove whole gui, on that i have my name, … ?
If you mean the CoreGui, no you cannot remove it.
The TopbarEnabled SetCore, keep in mind it needs to be pcall wrapped as you need to wait until the CoreScripts register the SetCore:
local sg = game:GetService("StarterGui")
local success
repeat
success = pcall(sg.SetCore, sg, "TopbarEnabled", false)
wait()
until success
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