Excel has this borders dropdown:
It allows you to very quickly add a variety of different border types to a selected group of cells, including a “thick border”. Although Libre has something similar:
…these are the only options, and they are all 0.75pt borders. Am I right in thinking there is no way to change this, so we can QUICKLY select say, a “thick border”? I know I can select → right-click → format cells → border and then change thickness to say 3pts, but that obviously takes a lot longer.