Thanks for taking a look anyway! I am assuming you mean PF2 and not DND 2E (just making sure)?
Manually adding encounters just to show a scouting party what's where and then removing superfluous ones does work. It can be quite slow with lots of tokens, though, and there always is the feeling that FGU still gets bogged down after the tokens/CT entries are deleted again.
These are the encounters of only the lower third of a bought PF2 adventure path open air map (+PC party):
https://i.imgur.com/x4h28o9.png
Fortunately I introduced regular heavy rain and fog in these jungle adventures, so vision and movement can be impeded. Never will a party be as happy to finally reach civilization again, though, as they are sick of all the rain (environment being their most unnerving adversary). Fortunately the next adventure is placed in a capital city. ;)