I've got that LibreCAD drawing from a friend of mine, and it's rather well done, except that the measurement numbers of like 20 or more drilling points are just too big. They intersect the measurement lines and even each other.
Is there a way to apply sth like "change the property "3 mm hight" of the font" to the measurements layer? It's exactly one layer.
Go to Options - Current Drawing Preferences - Dimensions. Here you can define the look of dimensions, like text size. Dimension line gap determines the position of the text above the main dimension line.
If you click on the dimension line a small blue square will appear at the text. Grab it with the mouse and you can pull the text anywhere. But if you alter anything in the dimensions setup all will slip back to the original position.
There also is a manual:https://librecad.readthedocs.io/ Worth studying, really!