How to Stop Automatic Capitalization?

Can someone please explain to me how I change LO's insistence on capitalizing words following a period, even if I don't want it? (i.e., "Yest. evening" is replaced by "Yest. Evening".)

TIA, Jonathan

Tools->Autocorrect Options->Options->Uncheck "Capitalize first letter of every sentence."

Alternately, Tools->AutoCorrect Options->Exceptions -- and choose
which words/abbreviations should NOT trigger a capital letter on the
next word.

Also, you can Ctrl+Z autocorrect, right after it capitalize the letter.​​
It works for (almost?) all autocorrect (changing -- to ̶, --> to arrows,
etc.)

Many thanks! jl