About bitcoin transaction fees, you can read more here:
Bitcoin Transaction Fees - Everything in oneYou have to change option in your wallet with these steps:
Tools > Preferences > Fees > Edit fees manually (you have to tick to this option).
Images below show those steps. After that, you can edit fees when you make your transactions.
I always consolidate my bitcoin at 1 satoshi/ byte. It takes time, but it help me to save precious satoshis.