Sadly, it isn’t possible (technically) to reset one course only. We would appreciate if you let us know what challenge you are trying to address, I could pass it to my team.
To have a few new words each day, you need to finish your repeat stack (the words you've already seen, but which still need some reminding) and after that, our algorithm will give you new words.
Hope you're enjoying Lingvist so far!
To switch the sound on/off, go to Account on your iOS app and then click on the gear icon at the top-right corner. Then you can toggle the sound on or off clicking the circle icon on the right-hand side.
Be sure that your phone is not on mute, to change that, switch the button on the side of your device to a position where you can not see the orange color.
The reason how you have learned more words than there are words in the course is that some words have been discarded from the course by our linguists. You have been able to learn the words before they were taken out.
You're correct, we're trying to improve the algorithm by doing tests and you happened to be in a group where new words are given before you complete your repeat stack.
In order to stop getting new words before the completion of the repeat stack:
This should take you back to the previous group and you can continue learning like you're used to.
I hope it's okay that I am giving a response in English. This feature has not been implemented to the web application, that's the reason why you can't see the speech input button there. I hope you're happy to use the feature on your Android device.