Copy and Paste to Import Oxygen Settings. This will make Oxygen set its default settings as on a fresh install.
{
"classes":[],
"custom_selectors":[],
"style_sets":{
"Uncategorized Custom Selectors":{}
},
"style_folders":[],
"style_sheets":[
{}
],
"global_settings":{},
"global_colors":{}
}