@leocg Found a fix. I had to "Copy address" of the actual side panel, open it in a tab, and zoom out for it to take effect in the side panel. Very strange, but it worked.
@david27 I don't know if Edge uses Chromium dictionaires or its own.
Probably its own then.
Well, a quick fix is to use brasilian portuguese dictionary instead, as it's closer to the up to date portuguese than the actual portuguese dictionary.