How to reduce transaction fee in electrum?

But in Electrum the fee size is already set. And if the transaction is at the beginning of the horizontal line and the transaction fee is 0.0005663 then there is no way one can reduce the size to reduce the fee again because it has ended. And when you increase the size the fee will also increase. Just like this image below.

What is the best option for fee estimation in electrum wallet?

However, this thread objective is mainly for 3 options for fee estimation in Electrum wallet. What is the best if you have to pick one as your default option and naively base on it for your transaction fee. It's a Mempool option. I checked it yesterday and again, Mempool option is the best.

Does electrum automatically bump the fee?

A couple of times I noticed a slight discrepancy between the fee that I did broadcast (always 1 sat/byte) and the fee (1.2-1.3 sat/byte) that was shown in the blockchain explorer. Such minor discrepancies suggest to me that Electrum somehow automates the process of bumping the fee up when needed.