This is not a Mod.. Its a guide to reset and hide the map markers that is unveiled with the Explorer Perk in KDC2. Step 1. enable "-devmode" in steam launch options. Or Right click the Desktop Shortcut --> properties. add -devmode at the end of the text in TARGET LINE.    Step 2. Drink Lethean Water. ( It resets all perks, including the Explorer Perk. ( If you don't have Lethean Water! Copy & Past this text into consol: wh_cheat_addItem 601f9ff2-0413-40c9-b443-9695aafa71a5 Step 3. Copy & Past this text into consol: wh_rpg_UndiscoverAll=1 It will undiscover all those greyed out points of interests from the map and fast travel points. You can now go an discover things normally and they'll show up on the map as per normal. However, this command does not put back the Map clouds. But I like that anyway. Last WARRNING. I have only done this once. I've played a few hours after and not had any problems.  But it can perhaps mess up the game for you, if you have a lot of missions going etc.  I have no idea if the Map markers in the Trosky region will still be there, if you choose to Travel Back with the Wagon.    This is not a Mod. Its a "Fix" Make sure you follow the instructions and do it in the right order.Don't complain if you lose save or progress. Its a RISK you take. 

PS. If you have trouble spawning Lethean Water. Its probably because -devmode is not active. 
I was able to to open Consol ("Tilde" key above TAB on your keyboard) but it didn't work, because I forgot to enable it first. )

I'm not an expert.. Just passing on some tips I found so you can get help too. 
If you learn something that ca help others, avoid mistakes etc. Please share. 

Hope this makes the game exploration more fun again. 

Good luck.