Need hor compilation with platform io

hi everyones, need help, when I want to compile, instead of ‘’ platformio… ‘’ I have ‘’ no task build founded. Build à task.
I have to àn ask to make change in. json two mode. One is UI, the another one I don’t remember.
Could somebody help me, before it was working very well, I use it to build firmware for a 3d printer. Thanks, Michel B.

Check recommendations in Clicking Build open a dropdown list.