I am NOT from the development team, I am NOT providing an official response....
I wasn't aware of OBS Studio being made available by OBS Studio team on Microsoft store...
so you installed may be either a malware version, or someone went to the effort on their own to post an old version...
someone else will have to comment on the version in MS store... I wasn't aware of it.. maybe do a search (in this forum or elsewhere) and see for yourself if any checked the Store version vs official source (this site) ... hopefully the Store version is the same... but I don't know that.