hidden, display:none

https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/hidden

https://developer.mozilla.org/en-US/docs/Web/CSS/display

// Some code
gAct.style.display = 'block';
gAct.style.display = 'none';

spnMaking.hidden = true;  // 
spnMaking.hidden = false;