See many a fall out over set ups like these working in construction industry. Shared pathway on left is a shared access path between yourself and house not adjoined, to 1. Create a semi detached property instead of a terraced property. 2. Ease of access to rear of property, opposed to a row of terraced houses having to cut through back gardens or have a rear access path for all neighbours of same with at back end of gardens. (More arguments over this also with people blocking access/ leaving rubbish/ using for storage etc) 3. Minimal land, hence shared path between two neighbours to create access to rear. House attached to yourself
I'm assuming your deeds will mention the area of your own driveway and highlight your own path shared with neighbour not attached. Attached house clearly has same path at right hand side leading from the alleyway at side of their own property. As for posters saying yours is evidently wider, yours is standard slab wide width, as is your neighbours, so no issue with access/ width/ squeezing up the side etc. they are chosing to walk past your window and down your path shared with non attached neighbour to save themselves a bit of distance/ time as not looping round their car.
For posters saying this is petty it definitely isn’t, you pay for your property and expect to be able to have quiet/ peaceful enjoyment of your own property; not lazy neighbours walking past your front window. And no you shouldn’t have to close your blinds/ curtains to allow them to continue taking a shortcut and just ignore them.
I’m assuming what I’ve pointed out is correct regarding deeds and sharing of path is only with non attached neighbour. It would be so much easier if developers created a physical barrier or allowed a strip of land for optional fence/hedging to separate properties and some just assume they can do what they want with little to no consequence. I would go with the good suggestions of the trellis planter or the canopy with trellis beside my door.
No idea what ever happened to common decency, though it has a lot to answer for with regards to property, land, parking etc disputes.