Doesn’t actually affect me but just a WWYD 
I live in a big house that’s been separated into 4 flats. We have the ground floor flat with its own fenced off patio (demised as ours and only accessible through our master bedroom). It’s not big but we’re very lucky to have it, particularly at the moment.
Beyond a low fence is a communal garden which all 4 flats have equal right of access over. We don’t use it due to the fact we have our own patio. Access is via the side gate of the house, so all flats have to come out of the main front door and wander around, but they’re not leaving their own property to do so. The other 3 flats are all couples in their 30s and 40s. No kids.
At the moment there is a stand off going on
Flat 2’s DH is often in the communal garden in all weathers smoking weed (another thread...). He is currently occupying the garden bench.
Flat 3 however have both been in the garden all morning and are very clearly annoyed about the presence of Flat 2. They’ve shifted their picnic blanket over into the far corner but aren’t exactly far from Flat 2 - maybe 10 foot, it’s not a massive garden and only certain sections get the sun through the day. On the one hand I can’t see the difference between the garden and a park, where I know people aren’t supposed to be mixing, but on the other hand it’s private land? We’ve been here 5 years and the summer always brings out some fun pass agg between the neighbours re the garden and the smoking but cv19 seems to be heightening it at the moment...
Basically, aside from calling me a completely nosy bugger (which I 100% am), would you use your communal garden at the moment? Is there any guidance on it?