I uh, blow a fan towards it and don't stare at it. The nice thing about those styles of lasers is you can just bring them to the project rather than dealing with the hassles of an enclosure and engineering a pass through. While I've seen some snazzy enclosures, they seemed to be a bit of an annoyance for the uses I often found for my laser- although they are admittedly an improvement for safety. Being able to just plop the machine down on a finished tabletop or large project for lasering is super convenient.
May I ask why you chose the xtool d1? The majority of diode lasers are essentially the same chineseium- normally belt and v rollers on a 2020 extrusion frame driven by low power steppers. Which is fine, it gets the job done just dandy- it just looks to me like you're paying more for a slightly dressier appearance.
You probably know this but don't trust wattage numbers on any Chinese laser. The "true" equivalent of most of the "20 watt" diode lasers is around 4.5-5w. That said for burning that is perfectly sufficient. If you want a more powerful diode, jtech photonics will get you there, but it's big money- about $700 for the (true) 7 watt, and $1000 for the 14. To my mind it is sort of pointless as if I need that much power I'm in hobbyist c02 laser territory. I guess you can always burn a little faster with more power...
I have an Ortur laser master pro 2. I paid $300 or so for it. Good machine and good accuracy, I have no complaints and it is the same size as the Xtool you're looking at, just not quite as dressy.
Just be really cautious with it. It is potentially a very hazardous beam. Buy high quality laser safety goggles, don't trust whatever comes from china with the machine.