Despite the typical 'Go buy a PC' and 'get good you suck' standard response to this sentiment from PC players, an option to not cross play is a valid and common sense option request for console v PC titles.
Taking the keyboard and mouse obvious and natural advantage, there is a real parity issue between the Xbox SoT experience and the PC one. The game simply runs faster on PC meaning players move quicker and ships can turn faster on PC compared to console which is another natural advantage over console PvP.
You then have the very obvious cheaters on PC making this a very toxic experience for console players (and fair playing PC players too). The simple solution is an option to simply have Xbox only regional servers, PC only regional servers and crossplay regional servers for those who wish to participate.
For the parity alone I would rather only play with fellow Xbox players, just as Street Fighter V does on PS4 for example which allows you to set matchmaking to PS4 only or crossplay match making.
It is a valid request worthy of consideration until parity and PC cheaters are no longer issues but we all know full well it will always be so and it is not like Microsoft doesn't have enough servers and Cloud power to run platform specific servers.
Doing so is a positive way forward, but realistically unlikely due to the italicised textrisk of separating playerbase numbers. But honestly, it would improve the experience immediately for Xbox players.