This is a known issue with Ventura. There is an article about the Ventura upgrade. You can use the arrow keys to select the line types once the drop down list is open. Also if you move the cursor to the left of the palette and further up the screen you will notice is starts to select the items. Using the arrow keys is easier though.
Lee Hankins ArchiCAD 4.5 - Archicad 27UKI Apple Silicon 5003 macOS Ventura (13.5.2)