The Status Bar at the bottom left of the screen always prompts you for your next action. I.e. when in the Wall Tool it will indicate “Enter First Node of PolyWall” or “Enter Next Node of PolyWall” etc.
In Work Environment, under Data Safety & Integrity, you have this option: Automatically Check Status of All Hotlinks in Hotlink Manager. It is checked by default. In projects with many hotlinks, the auto-check process might slow things down. In this case, uncheck this option.
The Coverings work differently for ArchiCAD 18 compared to ArchiCAD 17 tool. The new way the covering works will determine of the Door or Windows openings are detected by the coverings or not. The recommended practice for ArchiCAD 18 would be to have the right renovation default filter before applying the covering, so please