There doesn't seem to be a way to remove your location from your posts when you've allowed sharing. I've clicked the location icon to clear it before posting the new post...More in comments. #bugreportdone
Location:137 Mill Green Rd, Mitcham CR4 4HY, UK
but it shows up on the post anyway. I went into the browser's settings to reset location sharing then selected to block to clear it. But it appears to still be sharing. Thankfully the location is way off.