Patrick's Tips

Invisible Master Titleblock in layouts that prints

Master layouts can be toggled on/off in display - 
VIEW > ON-SCREEN VIEW OPTIONS > MASTER ITEMS ON LAYOUT

Window Background VS Pen 91

Window background is preferred as it is not affected by pen set changes.
Remember this not only for objects but for text and labels as well.

Check default layer of a tool before proceeding

Many things default to the Column layer, when you pick up a tool such as line, polyline or object. (and the Column layer is almost as prevalent as the ArchiCAD Layer).
Even using ALT-click to pick up an item's settings will also default to the Column layer on first click. The 2nd ALT-click will pick up the true settings of the item.