Remove Garmin Dezl POI,s

Hi.Just purchased a Garmin Dezl 760 LMT and beginning to set it up.
Downloaded “Garmin Express” on pc and updated the maps etc…
Having used it in the lorry today,I dont really need all the “poi,s” popping up all over the screen (Cafes,petrol stations,etc…)
Had a search on internet and read that if I connect Sat Nav to pc, then find the poi folder,I can delete the poi,s.
Before I do this…does anyone know if this will disable the speed cameras etc?
Also…is there a fix to increase the old 40mph limit to 50mph for lorries? (fed up of all the "beeping and warning sounds when travelling over 40mph).
Many thanks