Hi kierajohnston, welcome to the forum.
We do have a few Libre CGM users on the forum that may be able to answer your question when they check in. In the meantime, would you mind posting a new member introduction so others may get to know you better.
No issues here once I worked out how to set the alarm (I had no clue when I first got the Libre2), but I just use the “custom” alarm noise, which is strident and not able to be ignored. You also need to set it to override ”Do Not Disturb”. The “low” alarm is louder and more strident than the high one, which I sometimes don’t notice. The standard sound is just a tritone, which I never notice.