Convert all live captions to static captions (Easy way)

Hi @Nuria28295192ksa4 , For existing captions,  I think you will have to invoke the Convert To Static Caption menu item. Try this:

var tf = app.activeDocument.pages.everyItem().textFrames.everyItem().getElements()
var mi =  app.menuActions.itemByID(132655)
for (var i = 0; i < tf.length; i++){
    app.select(tf[i])
    if(mi.enabled){  
        mi.invoke();  
    };
};