Can I deleting the transaction from my wallet. I have Electrum 2.5.4 and sent transaction with custom fee 0.0001. the transaction is marked as low priority and it`s not confirmed yet.
No. You cannot delete a sent transaction. If it never gets processed by the network it will eventually just goe away on its own when deleted from the pool of pending transactions. A low priority transaction will normally eventually get in a block but it could take a day or two or longer.