You have to configure the settings for FVM per site.
Furthermore, if you have a cache plugin, and purge all FVM files at once without purging the page cache after, the css and js files will not be found anymore (because the html will referefence files you just deleted).
Nevertheless, if you want a common directory, you can change the cache path under the Pro tab to wp-content/cache (or anywhere else public). That way, purging fvm cache will purge from all sites. Just make sure to purge the cache plugins on all sites too.
thank you, and just another question,
is the way or option that set time or something else to clear FVM cache automatically?
thank you, and just another question,
is the way or option that set time or something else to clear FVM cache automatically?
No, but you could code it yourself to run a function with the frequency you want.
https://wordpress.org/support/topic/schedule-cache-clearing/
