Every patch has some options inside it. it is an object so after you open it you can set whether the background is opaque or not.
As for the disappeareing, check that the folder with your patches is loaded as a library container. Also check that the patche's layers are visible.
HTH
Petros
ArchiCAD 22 4023 UKI FULL,
Archicad 21 6013 UKI FULL, ArchiCAD 20 8005 UKI FULL
iMac Retina 5K, 27-inch, 2017
4.2 GHz Intel Core i7
32 GB 2400 MHz DDR4
Radeon Pro 580 8192 MB