PuTTY: disable copy-paste on mouse selection

The "copy on selection" feature likely cannot be disabled. The PuTTY manual (specifically 3.1.1 Copying and pasting text) does not specify any way to disable copy on selection.

As a workaround, consider using a different client. I use Cygwin which includes mintty terminal client which does have an option to disable "Copy on select."

You can Disable copy/ paste by going to putty configuration \ windows \ selection

then change "Mouse Paste Action" to "No Action" to disable mouse paste and then uncheck "Auto-copy selected text to system clipboard" to disable mouse copy

then save to session settings for all sessions