cmake tab:
cmake tab
chooses what to build

build all:
same as f7 or ctrl+shift+b
build all

just build docs:
build docs
the output will be in: build/rm_pico_dev/docs/html/index.html
to view double click the file and open in browser

you can also just choose what other libs to build

If you getting weird cmake erros sometimes just run:
rebuild

choose kit:
choose kit

choose what to build:
choose build
then click to build:
builld