I tried the live map on my Android, and indeed, there is a filter. But screen is so small that it is impossible to set a range of exactly 800 to 850 (just an example).
So just now tried on my laptop, Windows 10, in FireFox, Opera and Chrome, but when I click on the filter button, or settings or any of the other 2 in that bar), nothing happens (except the URL changes to https://project-gc.com/Tools/LiveMap#filter
No popup menu where I can set the filters. Have not tried it again on my phone anymore yet.
What I miss is; a easy to find place, where you can filter on everything:
+ just like in the new serach window of GC.com
+ the serach criteria for a Pocket Query
+ location, country, county, community, city, region