Ma3667

Thanks Nick, appreciate the advice

First time poster so apologies if this is in the wrong place. i have recently moved into a first floor flat and upon pulling up the carpet in my hallway I’ve found a fairly wide crack in the screed. I’m wondering firstly, if this is anything to be concerned about (structurally) and secondly, what’s the best way to repair? I plan to put down new carpet once sorted. crack seems to be through the full depth of the screed at least in places but stable and level on both sides (maybe 1mm difference between sides). Crack is 4/5mm wide, on top of underfloor heating and the flat is a fairly new build around 15 years old. No other cracks in walls or skirting.