Relates to Mac OS 10.14.
I have problems with QGIS 2.18. Plugins not working etc. (latest problem is not being able to make a virtual raster catalogue of landsat 8 tiles. Error message : "The process failed to start. Either the invoked program is missing, or you may have insufficient permissions to invoke the program.")
So I uninstalled QGIS by dragging QGIS.app from applications folder to trash and emptying trash.
Reinstalled QGIS 2.18.
Opened QGIS 2.18.
It remembered all the settings etc !
How can I delete QGIS 2.18 to start completely fresh ? I imagine it's okay to keep the QGIS-OSX-2.18.28-1.dmg (this has all the packages required for QGIS to run) I also have QGIS3 installed on the machine (also problems there) but I take it the two don't interfere, so I don't need to delete QGIS 3?
All help welcome.