Ableton Forum

I am tearing my hair out with this. I have even found the 'answer' but cannot make it work for me. I am new to DAWs but loving ableton - if only I could crack this. For ease I recorded my problem and thank you in advance if you are able to take the time to help

https://youtu.be/0snXVgi2ywc

I have a feeling the answer will be obvious so apologise in advance
Thanks