Seem to be very random by the commentaries. Did not work for me...
However, I did find a solution that's a bit odd.
Some Synaptics touchpads doesn't have the option to disable the edge swipe. Reg edits does not seem to work.
A thing that did work was to uninstall the Synaptics driver and restart. Windows will install it's own driver and no egde swipes.
You'll lose lots of Synaptics specific settings thou.
There's a better solution: download a old driver!
"Synaptics TouchPad Driver 16.2.21" seem to be the magic driver. I read on some forums that ppl had success with this driver and tried it.
Bingo. Edge swipes can finally be disabled without losing the Synaptics settings.
Been using it for a few days without any downsides.