This is a minor but constant irritation, encountered every time I use Audacity. I use only flac. To save in flac I have to tell Audacity to save as a wav, then pick flac from a drop down list. That is sort of silly. Flac is the format of choice for many audiophiles (being lossless and all). Please add flac as an option for saving without first asking to save as a wav.
Select “File menu > Export Audio…” (or “Ctrl + Shift+ E”).
In the export dialog, select FLAC and the required bit depth, and export.
The next time that you use “File menu > Export Audio…”, FLAC will already be the selected format.