Are there any education material for using coin control on electrum
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In addition to all other responses I would recommend to connect Electrum to
testnet (read also
this)and try all coin control features by yourself using test coins before experimenting with real coins on mainnet.
The best educational material is that one which was submitted to you by your experience.
If I wanted to move them all the unspent UXTO's to another address can I do so while frozen?