Microsoft has already made available to users the version 1903 of Windows 10 (corresponding to the update of May 2019), which among other things includes the option to activate the variable refresh rate from the menu of graphic options. The interesting thing about this function is that it is implemented even in games that are not compatible as standard. This option allows to play all the titles more smoothly thanks to the synchronization between the graphic card and the screen; something that technologies like FreeSync, of AMD, and G-Sync, of Nvidia, make reality.
In principle, the technologies of each company already make up for the gaps that the games may have, but according to the publication on the blog of Microsoft developers, this update allows DirectX 11 games to enable the variable refresh rate even though they do not have it as standard. Apparently the Windows Store games did not include this functionality originally, and although there was a point at which the implementation depended on the developers, this new option makes it possible in all games.