How can i disable Insync searching for the income shares ?
If you go to the “Incoming shares” menu on the left side of insync, you should see the “Keep all in cloud” option in the top right corner of the shown window. That way, the software won’t be trying to sync them on your computer.
As for new shares from that point, I’m really not sure. Probably if there was a way to configure Google Drive to ignore incoming shares directly, they wouldn’t show insync as well.
Hope this answers your question (and that I understood the question, first! )
Have a great evening!