Is it possible, to remove control panel?

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.

I mean this

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 

    success = pcall(sg.SetCore, sg, "TopbarEnabled", false)
until success
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