I haven't used the wallet before, but I've heard that when you send bitcoins the transaction can be cancelled for a short time.
Is this really the case?
It mainly depends on the setting: "
Tools->Preferences->Transactions->Use Replace-By-Fee".
If it's disabled, the option "
cancel (double-spend)" wont show up in the unconfirmed transaction's right-click menu.
On a side note, that behavior might change depending on the Electrum servers and bitcoin node users' decision on "
Full RBF" which is already available in the latest version of Bitcoin Core.
If most Bitcoin Core nodes enable the option
mempoolfullrbf=1 (
which is disable by default), the Electrum setting above wont be necessary.