Changing Keyboard/Input Source order on MacOS I'm using quite a few input languages on my Mac (10.14) and found out that whenever I open a new app, the default selected language will be Chinese (Pinyin as shown on the photo below). And I believe it has to do with the order that my Input Sources are selected. I would like to put the English keyboard (U.S. International) language as default, however, there is no way of simply pull it to the top. I hope somebody can give me suggestions on how to do it. Thanks!
It is impossible to re-order them. To fix it, you want to tick Show Input in menu bar. This will cause a little icon to appear in your menu bar with your language:



(The icon might  be different depending on the language set). If you click there you can change the language to U.S. International - PC. 

If you still want to use another language for a specific app (say you want to use English for all apps except Safari where you want to use Russian), you can either:


Change the language in the menu bar
Keep Automatically switch to a document's input source checked which will remember your last language for that application