Quite frustrating. I very rarely dictate a full sentence from beginning to end, so I normally need lower case. But, if I select “default”, it will always capitalize the 1st letter of each word anywhere in the sentence (it did not do this for some time). I tried switching to “lower case” and using a voice comand for capitalizing, but that voice command does not work when “lower case” is selected. I keep having to “manually” change the first letter of words. I just bought a year’s subscription and I’m starting to regret it…
You should set the dictation case to “Sentence case”
See How to correct capitalization mistakes? | Voice In Support