Ah, OK. Now I understand.
The setting you are tweaking is for coins – and it affects UIs for the parent plugin, Bitcoin and Altcoin Wallets.
What you actually want to do is affect the default market, within the context of the exchange extension.
Right now it’s not possible to affect the ordering of markets, but it is possible to select one market that is pre-selected when the page loads:
Go to “Wallets” -> “Exchange” -> “Markets” and use the radio button under the “Site-wide default” column, to select the default market.
Hope this helps.
with regards